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- Make sure correct information is supplied for both old kernels (with

Browse source 
ethertap) and for new kernels (with TUN/TAP driver).
- Revised example configuration and made it conform to latest (CVS) version of
  tinc.
This commit is contained in:
Guus Sliepen 2001-05-19 15:50:51 +00:00
parent e4f3d93ec6
commit 6f7f8659a2
1 changed files with 211 additions and 210 deletions
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doc/tinc.texi
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@ -1,5 +1,5 @@
\input texinfo @c -*-texinfo-*-
@c $Id: tinc.texi,v 1.8.4.14 2001/01/18 13:00:57 zarq Exp $
@c $Id: tinc.texi,v 1.8.4.15 2001/05/19 15:50:51 guus Exp $
@c %**start of header
@setfilename tinc.info
@settitle tinc Manual
@ -17,7 +17,7 @@ Copyright @copyright{} 1998-2001 Ivo Timmermans
<itimmermans@@bigfoot.com>, Guus Sliepen <guus@@sliepen.warande.net> and
Wessel Dankers <wsl@@nl.linux.org>.
$Id: tinc.texi,v 1.8.4.14 2001/01/18 13:00:57 zarq Exp $
$Id: tinc.texi,v 1.8.4.15 2001/05/19 15:50:51 guus Exp $
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
@ -42,7 +42,7 @@ Copyright @copyright{} 1998-2001 Ivo Timmermans
<itimmermans@@bigfoot.com>, Guus Sliepen <guus@@sliepen.warande.net> and
Wessel Dankers <wsl@@nl.linux.org>.
$Id: tinc.texi,v 1.8.4.14 2001/01/18 13:00:57 zarq Exp $
$Id: tinc.texi,v 1.8.4.15 2001/05/19 15:50:51 guus Exp $
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
@ -182,6 +182,7 @@ tinc will run on them as well. Without this driver, tinc will most
likely compile and run, but it will not be able to send or receive data
packets.
The official release only truly supports Linux.
For an up to date list of supported platforms, please check the list on
our website:
@uref{http://tinc.nl.linux.org/platforms.html}.
@ -197,16 +198,15 @@ and arbitrary word length. So in theory it should run on other
processors that Linux runs on. It has already been verified to run on
alpha and sparc processors as well.
tinc uses the ethertap device that is provided in the standard kernel
since version 2.1.60, so anything above that (2.2.x, 2.3.x, and 2.4.0)
kernel version is able to support tinc.
tinc uses the ethertap device or the universal TUN/TAP driver. The former is provided in the standard kernel
from version 2.1.60 up to 2.3.x, but has been replaced in favour of the TUN/TAP driver in kernel versions 2.4.0 and later.
@c ==================================================================
@subsection FreeBSD
tinc on FreeBSD relies on the universial TUN/TAP driver for its data
acquisition from the kernel. Therefore, tinc suports the same platforms
acquisition from the kernel. Therefore, tinc works on the same platforms
as this driver. These are: FreeBSD 3.x, 4.x, 5.x.
@ -214,7 +214,7 @@ as this driver. These are: FreeBSD 3.x, 4.x, 5.x.
@subsection Solaris
tinc on Solaris relies on the universial TUN/TAP driver for its data
acquisition from the kernel. Therefore, tinc suports the same platforms
acquisition from the kernel. Therefore, tinc works on the same platforms
as this driver. These are: Solaris, 2.1.x.
@ -248,13 +248,14 @@ support tinc.
@node Configuring the kernel, Libraries, Installing tinc - preparations, Installing tinc - preparations
@section Configuring the kernel
If you are running Linux, chances are good that your kernel already
supports all the devices that tinc needs for proper operation. For
example, the standard kernel from Redhat Linux already has support for
ethertap and netlink compiled in. Debian users can use the modconf
utility to select the modules. If your Linux distribution supports this
method of selecting devices, look out for something called `ethertap',
and `netlink_dev'. You need both these devices.
If you are running Linux, chances are good that your kernel already supports
all the devices that tinc needs for proper operation. For example, the
standard kernel from Redhat Linux already has support for ethertap and netlink
compiled in. Debian users can use the modconf utility to select the modules.
If your Linux distribution supports this method of selecting devices, look out
for something called `ethertap', and `netlink_dev' if it is using a kernel
version prior to 2.4.0. In that case you will need both these devices. If you
are using kernel 2.4.0 or later, you need to select `tun'.
If you can install these devices in a similar manner, you may skip this
section.
@ -270,69 +271,67 @@ section.
@node Configuration of the Linux kernel, Configuration of the FreeBSD kernel, Configuring the kernel, Configuring the kernel
@subsection Configuring the Linux kernel
Since this particular implementation only runs on 2.1 or higher Linux
kernels, you should grab one (2.2 is current at this time). A 2.0 port
is not really possible, unless someone tells me someone ported the
ethertap and netlink devices back to 2.0.
First of all, a kernel version of 2.1.60 or higher is @emph{required}.
If you are unfamiliar with the process of configuring and compiling a
new kernel, you should read the
@uref{http://howto.linuxberg.com/LDP/HOWTO/Kernel-HOWTO.html, Kernel
HOWTO} first. Do that now!
Here are the options you have to turn on when configuring a new
kernel.
Here are the options you have to turn on when configuring a new kernel.
For kernel 2.2.x:
For kernels 2.1.60 up to 2.4.0:
@example
Code maturity level options
[*] Prompt for development and/or incomplete code/drivers
Networking options
[*] Kernel/User netlink socket
<*> Netlink device emulation
<M> Netlink device emulation
Network device support
<*> Ethertap network tap
<M> Ethertap network tap
@end example
Note that if you want to run more than one instance of tinc or other
programs that use the ethertap, you have to compile the ethertap driver
as a module.
If you want to run more than one instance of tinc or other programs that use
the ethertap, you have to compile the ethertap driver as a module, otherwise
you can also choose to compile it directly into the kernel.
For kernel 2.3.x and 2.4.x:
If you decide to build any of these as dynamic kernel modules, it's a good idea
to add these lines to @file{/etc/modules.conf}:
@example
Code maturity level options
[*] Prompt for development and/or incomplete code/drivers
Networking options
[*] Kernel/User netlink socket
<*> Netlink device emulation
Network device support
<*> Universal TUN/TAP device driver support
@end example
Any other options not mentioned here are not relevant to tinc. If you
decide to build any of these as dynamic kernel modules, it's a good idea
to add these lines to @file{/etc/modules.conf}.
@example
alias tap0 ethertap
alias char-major-36 netlink_dev
alias tap0 ethertap
options tap0 -o tap0 unit=0
alias tap1 ethertap
options tap1 -o tap1 unit=1
@end example
If you have a 2.4-pre kernel, you can choose both the TUN/TAP driver and
the `Ethertap network tap' device. This latter is marked obsolete,
because the universal TUN/TAP driver is a newer implementation that is
supposed to be used in favour of ethertap. For tinc, it doesn't really
matter which one you choose; based on the device file name, tinc will make
the right choice about what protocol to use. However, chances are that
although you can choose the obsolote ethertap driver, it will not function
at all. The TUN/TAP driver is the safe choice.
Add more alias/options lines if necessary.
Finally, after having set up other options, build the kernel and boot
it. Unfortunately it's not possible to insert these modules in a
running kernel.
For kernels 2.4.0 and higher:
@example
Code maturity level options
[*] Prompt for development and/or incomplete code/drivers
Network device support
<M> Universal TUN/TAP device driver support
@end example
It's not necessary to compile this driver as a module, even if you are going to
run more than one instance of tinc.
If you have an early 2.4 kernel, you can choose both the TUN/TAP driver and the
`Ethertap network tap' device. This latter is marked obsolete, and chances are
that it won't even function correctly anymore. Make sure you select the
universal TUN/TAP driver.
If you decide to build the TUN/TAP driver as a kernel module, add these lines
to @file{/etc/modules.conf}:
@example
alias char-major-10-200 tun
@end example
@c ==================================================================
@ -379,9 +378,7 @@ having installed it, configure will give you an error message, and stop.
@cindex OpenSSL
For all cryptography-related functions, tinc uses the functions provided
by the OpenSSL library. We recommend using version 0.9.5 or 0.9.6 of
this library. Other versions may also work, but we can guarantee
nothing.
by the OpenSSL library.
If this library is not installed, you wil get an error when configuring
tinc for build. Support for running tinc without having OpenSSL
@ -496,22 +493,8 @@ may read/write to this file. You'd want this, because otherwise
eavesdropping would become a bit too easy. This does, however, imply
that you'd have to run tincd as root.
If you use the universal TUN/TAP driver, you have to create the
following device files (unless they already exist):
@example
mknod -m 600 /dev/... c .. ..
chown 0.0 /dev/...
@end example
If you want to have more devices, the device numbers will be .. .. ...
If you use Linux, and you run the new 2.4 kernel using the devfs
filesystem, then the tap device will be automatically generated as
@file{/dev/netlink/tap0}.
If you use Linux and have kernel 2.2.x, you have to make the ethertap
devices:
If you use Linux and have a kernel version prior to 2.4.0, you have to make the
ethertap devices:
@example
mknod -m 600 /dev/tap0 c 36 16
@ -520,6 +503,18 @@ chown 0.0 /dev/tap0
Any further ethertap devices have minor device number 16 through 31.
If you use the universal TUN/TAP driver, you have to create the
following device files (unless they already exist):
@example
mknod -m 600 /dev/tun c 10 200
chown 0.0 /dev/tun
@end example
If you use Linux, and you run the new 2.4 kernel using the devfs filesystem,
then the TUN/TAP device will probably be automatically generated as
@file{/dev/net/tun}.
@c ==================================================================
@node Other files, , Device files, System files
@ -534,10 +529,6 @@ symbolic name. For example:
myvpn 10.0.0.0
@end example
This has nothing to do with the MyVPNIP configuration variable that will be
discussed later, it is only to make the output of the route command more
legible.
@subsubheading @file{/etc/services}
You may add this line to @file{/etc/services}. The effect is that you
@ -555,7 +546,7 @@ tinc 655/udp TINC
@node Interfaces, , System files, Installing tinc - installation
@section Interfaces
Before you can start transmitting data over the tinc tunnel, you must
Before you can start transmitting data over the tinc tunnel, tinc must
set up the ethertap network devices.
First, decide which IP addresses you want to have associated with these
@ -563,35 +554,45 @@ devices, and what network mask they must have. You also need these
numbers when you are going to configure tinc itself. @xref{Configuring
tinc}.
It doesn't matter much which part you do first, setting up the network
devices or configure tinc. But they both have to be done before you try
to start a tincd.
tinc will open an ethertap device or TUN/TAP device, which will also
create a network interface called `tap0', `tap1' etc. if you are using
the ethertap driver, or a network interface with the same name as NETNAME
if you are using the universal TUN/TAP driver.
The actual setup of the ethertap device is quite simple, just repeat
after me:
You can configure that device by putting ordinary ifconfig, route, and other commands
to a script named @file{/etc/tinc/NETNAME/tinc-up}. When tinc starts, this script
will be executed. When tinc exits, it will execute the script named
@file{/etc/tinc/NETNAME/tinc-down}, but normally you don't need to create that script.
An example @file{tinc-up} script when using the TUN/TAP driver:
@example
ifconfig tap@emph{n} hw ether fe:fd:00:00:00:00
ifconfig $NETNAME hw ether fe:fd:00:00:00:00
ifconfig $NETNAME @emph{xx}.@emph{xx}.@emph{xx}.@emph{xx} netmask @emph{mask}
ifconfig $NETNAME -arp
@end example
@cindex MAC address
@cindex hardware address
@strong{Note:} Since version 1.0pre3, all interface addresses are set to
this address, whereas previous versions required the MAC to match the
actual IP address.
The first line sets up the MAC address of the network interface.
Due to the nature of how ethernet and tinc work, it has to be set to fe:fd:00:00:00:00.
(tinc versions prior to 1.0pre3 required that the MAC address matched the IP address.)
You can use the environment variable $NETNAME to get the name of the interface.
If you are using the ethertap driver however, you need to replace it with tap@emph{n},
corresponding to the device file name.
@cindex ifconfig
To activate the device, you have to assign an IP address to it. To set
an IP address @emph{IP} with network mask @emph{mask}, do the following:
@example
ifconfig tap@emph{n} @emph{xx}.@emph{xx}.@emph{xx}.@emph{xx} netmask @emph{mask}
@end example
The next line gives the interface an IP address and a netmask.
The kernel will also automatically add a route to this interface, so normally you don't need
to add route commands to the @file{tinc-up} script.
The kernel will also bring the interface up after this command.
@cindex netmask
The netmask is the mask of the @emph{entire} VPN network, not just your
own subnet. It is the same netmask you will have to specify with the
VpnMask configuration variable.
own subnet.
@cindex arp
The last line tells the kernel not to use ARP on that interface.
Again this has to do with how ethernet and tinc work. Don't forget to add this line.
@c
@ -735,22 +736,6 @@ impossible to crack a single key.
Listen on local port port. The computer connecting to this daemon should
use this number as the argument for his ConnectPort.
@item MyOwnVPNIP = <local address[/maskbits]> (required)
The local address is the number that the daemon will propagate to
other daemons on the network when it is identifying itself. Hence this
will be the file name of the passphrase file that the other end expects
to find the passphrase in.
The local address is the IP address of the tap device, not the real IP
address of the host running tincd. Due to changes in recent kernels, it
is also necessary that you make the ethernet (also known as MAC) address
equal to the IP address (see the example).
maskbits is the number of bits set to 1 in the netmask part.
@item MyVirtualIP = <local address[/maskbits]>
This is an alias for MyOwnVPNIP.
@item @strong{Name = <name>}
This is a symbolic name for this connection. It can be anything
@ -760,30 +745,17 @@ probe to the other end. If that other end doesn't answer within that
same amount of seconds, the connection is terminated, and the others
will be notified of this.
@item @strong{PrivateKey = <key>}
@item PrivateKey = <key> (obsolete)
This is the RSA private key for tinc. However, for safety reasons it is
advised to store private keys of any kind in separate files. This prevents
accidental eavesdropping if you are editting the configuration file.
@item PrivateKeyFile = <path>
@item @strong{PrivateKeyFile = <path>} (recommended)
This is the full path name of the RSA private key file that was
generated by ``tincd --generate-keys''. It must be a full path, not a
relative directory.
@item PublicKey = <key>
This is the full path name of the RSA public key file that was generated
by ``tincd --generate-keys''. It must be a full path, not a relative
directory. (NOTE: In version 1.0pre3, this variable was used to give
the key inline. This is no longer supported.)
@item Subnet = <IP address/maskbits>
This is the subnet range of all IP addresses that will be accepted by
the host that defines it. Please be careful that no two subnets
overlap. Every host @strong{must} have a different range of IP
addresses that it can handle, otherwise you will see messages like
`packet comes back to us'.
@item TapDevice = <device> (/dev/tap0)
@item @strong{TapDevice = <device>} (/dev/tap0)
The ethertap device to use. Note that you can only use one device per
daemon. The info pages of the tinc package contain more information
about configuring an ethertap device for Linux.
@ -794,11 +766,6 @@ connection instead of a UDP connection. This is especially useful for those
who want to run a tinc daemon from behind a masquerading firewall, or if
UDP packet routing is disabled somehow. This is experimental code,
try this at your own risk.
@item VpnMask = <mask> (optional)
The mask that defines the scope of the entire VPN. This option is not used
by the tinc daemon itself, but can be used by startup scripts to configure
the ethertap devices correctly.
@end table
@ -812,7 +779,7 @@ This variable is only required if you want to connect to this host. It
must resolve to the external IP address where the host can be reached,
not the one that is internal to the VPN.
@item IndirectData = <yes|no> (no)
@item IndirectData = <yes|no> (no, experimental)
This option specifies whether other tinc daemons besides the one you
specified with ConnectTo can make a direct connection to you. This is
especially useful if you are behind a firewall and it is impossible to
@ -825,15 +792,18 @@ port port. port may be given in decimal (default), octal (when preceded
by a single zero) o hexadecimal (prefixed with 0x). port is the port
number for both the UDP and the TCP (meta) connections.
@item PublicKey = <key>
@item PublicKey = <key> (obsolete)
This is the RSA public key for this host.
@item PublicKeyFile = <path>
@item PublicKeyFile = <path> (obsolete)
This is the full path name of the RSA public key file that was generated
by ``tincd --generate-keys''. It must be a full path, not a relative
directory.
Note that exactly @strong{one of the above two options} must be specified
From version 1.0pre4 on tinc will store the public key directly into the
host configuration file in PEM format, the above two options then are not
necessary. Either the PEM format is used, or exactly
@strong{one of the above two options} must be specified
in each host configuration file, if you want to be able to establish a
connection with that host.
@ -849,12 +819,12 @@ example: netmask 255.255.255.0 would become /24, 255.255.252.0 becomes
/22. This conforms to standard CIDR notation as described in
@uref{ftp://ftp.isi.edu/in-notes/rfc1519.txt, RFC1519}
@item TCPonly = <yes|no> (no)
@item TCPonly = <yes|no> (no, experimental)
If this variable is set to yes, then the packets are tunnelled over a
TCP connection instead of a UDP connection. This is especially useful
for those who want to run a tinc daemon from behind a masquerading
firewall, or if UDP packet routing is disabled somehow. @emph{This is
experimental code, try this at your own risk. It may not work at all.}
firewall, or if UDP packet routing is disabled somehow. This is
experimental code, try this at your own risk. It may not work at all.
@end table
@ -883,7 +853,7 @@ location, the department, or the name of one of your boss' pets. It can
be anything, as long as all these names are unique across the entire
VPN.
@item PrivateKey
@item PrivateKeyFile
Fill in the full pathname to the file that contains the private RSA key.
@item ConnectTo
@ -898,12 +868,15 @@ until someone connects to it.
Then you should create a file with the name you gave yourself in
tinc.conf (the `Name' parameter), located in
@file{/etc/tinc/vpn-name/hosts/}. In this file, which we call the
`@emph{host configuration file}', only one variable is required:
`@emph{host configuration file}', the public key must be present
and one variable is required:
@table @samp
@item Subnet
The IP range that this host accepts as being `local'. All packets with
a destination address that is within this subnet will be sent to us.
Actually it is not stricly required, but you need it to send packets to
other tinc daemons.
@end table
@ -911,17 +884,14 @@ a destination address that is within this subnet will be sent to us.
Now for all hosts that you want to create a direct connection to, -- you
connect to them or they connect to you -- you get a copy of their host
configuration file and their public RSA key.
configuration file.
For each host configuration file, you add two variables:
If it is not already present, make sure you add this variable:
@table @samp
@item Address
Enter the IP address or DNS hostname for this host. This is only needed
if you connect to this host.
@item PublicKey
Put the full pathname to this hosts public RSA key here.
@end table
When you did this, you should be ready to create your first connection.
@ -935,7 +905,7 @@ there. If you get an error, you can check @ref{Error messages}.
@cindex example
Imagine the following situation. An A-based company wants to connect
Imagine the following situation. Branch A of our example `company' wants to connect
three branch offices in B, C and D using the internet. All four offices
have a 24/7 connection to the internet.
@ -959,142 +929,173 @@ In this example, it is assumed that eth0 is the interface that points to
the inner (physical) LAN of the office, although this could also be the
same as the interface that leads to the internet. The configuration of
the real interface is also shown as a comment, to give you an idea of
how these example host is set up.
how these example host is set up. All branches use the netname `company'
for this particular VPN.
@subsubheading For A
@subsubheading For Branch A
@emph{A} would be configured like this:
@emph{BranchA} would be configured like this:
In @file{/etc/tinc/company/tinc-up}:
@example
#ifconfig eth0 10.1.54.1 netmask 255.255.0.0 broadcast 10.1.255.255
# Real interface of internal network:
# ifconfig eth0 10.1.54.1 netmask 255.255.0.0 broadcast 10.1.255.255
ifconfig tap0 hw ether fe:fd:00:00:00:00
ifconfig tap0 10.1.54.1 netmask 255.0.0.0
ifconfig tap0 -arp
@end example
and in /etc/tinc/tinc.conf:
and in @file{/etc/tinc/company/tinc.conf}:
@example
Name = A
PrivateKey = /etc/tinc/A.priv
VpnMask = 255.0.0.0
Name = BranchA
PrivateKey = /etc/tinc/company/rsa_key.priv
TapDevice = /dev/tap0
@end example
On all hosts, /etc/tinc/hosts/A contains:
On all hosts, /etc/tinc/company/hosts/BranchA contains:
@example
Subnet = 10.1.0.0/16
Address = 1.2.3.4
PublicKey = /etc/tinc/hosts/A.pub
-----BEGIN RSA PUBLIC KEY-----
...
-----END RSA PUBLIC KEY-----
@end example
@subsubheading For B
@subsubheading For Branch B
In @file{/etc/tinc/company/tinc-up}:
@example
#ifconfig eth0 10.2.43.8 netmask 255.255.0.0 broadcast 10.2.255.255
# Real interface of internal network:
# ifconfig eth0 10.2.43.8 netmask 255.255.0.0 broadcast 10.2.255.255
ifconfig tap0 hw ether fe:fd:00:00:00:00
ifconfig tap0 10.2.1.12 netmask 255.0.0.0
ifconfig tap0 -arp
@end example
and in /etc/tinc/tinc.conf:
and in @file{/etc/tinc/company/tinc.conf}:
@example
Name = B
ConnectTo = A
PrivateKey = /etc/tinc/B.priv
VpnMask = 255.0.0.0
Name = BranchB
ConnectTo = BranchA
PrivateKey = /etc/tinc/company/rsa_key.priv
@end example
Note here that the internal address (on eth0) doesn't have to be the
same as on the tap0 device. Also, ConnectTo is given so that no-one can
connect to this node.
On all hosts, /etc/tinc/hosts/B:
On all hosts, in @file{/etc/tinc/company/hosts/BranchB}:
@example
Subnet = 10.2.0.0/16
Address = 2.3.4.5
PublicKey = /etc/tinc/hosts/B.pub
-----BEGIN RSA PUBLIC KEY-----
...
-----END RSA PUBLIC KEY-----
@end example
@subsubheading For C
@subsubheading For Branch C
In @file{/etc/tinc/company/tinc-up}:
@example
#ifconfig eth0 10.3.69.254 netmask 255.255.0.0 broadcast 10.3.255.255
ifconfig tap0 hw ether fe:fd:00:00:00:00
ifconfig tap0 10.3.69.254 netmask 255.0.0.0
# Real interface of internal network:
# ifconfig eth0 10.3.69.254 netmask 255.255.0.0 broadcast 10.3.255.255
ifconfig tap1 hw ether fe:fd:00:00:00:00
ifconfig tap1 10.3.69.254 netmask 255.0.0.0
ifconfig tap1 -arp
@end example
and in /etc/tinc/A/tinc.conf:
and in @file{/etc/tinc/company/tinc.conf}:
@example
Name = C
ConnectTo = A
Name = BranchC
ConnectTo = BranchA
TapDevice = /dev/tap1
VpnMask = 255.0.0.0
@end example
C already has another daemon that runs on port 655, so they have to
reserve another port for tinc. It can connect to other tinc daemons on
the regular port though, so no ConnectPort variable is needed. They
also use the netname to distinguish between the two. tinc is started
with `tincd -n A'.
reserve another port for tinc. It knows the portnumber it has to listen on
from it's own host configuration file.
On all hosts, /etc/tinc/hosts/C:
On all hosts, in @file{/etc/tinc/company/hosts/BranchC}:
@example
Address = 3.4.5.6
Subnet = 10.3.0.0/16
Port = 2000
PublicKey = /etc/tinc/hosts/C.pub
-----BEGIN RSA PUBLIC KEY-----
...
-----END RSA PUBLIC KEY-----
@end example
@subsubheading For D
@subsubheading For Branch D
In @file{/etc/tinc/company/tinc-up}:
@example
#ifconfig tap0 10.4.3.32 netmask 255.255.0.0 broadcast 10.4.255.255
# Real interface of internal network:
# ifconfig tap0 10.4.3.32 netmask 255.255.0.0 broadcast 10.4.255.255
ifconfig tap0 hw ether fe:fd:0a:04:03:20
ifconfig tap0 10.4.3.32 netmask 255.0.0.0
ifconfig tap0 -arp
@end example
and in /etc/tinc/tinc.conf:
and in @file{/etc/tinc/company/tinc.conf}:
@example
MyVirtualIP = 10.4.3.32/16
ConnectTo = 3.4.5.6
ConnectPort = 2000
VpnMask=255.0.0.0
Name = BranchD
ConnectTo = BranchC
PrivateKeyFile = /etc/tinc/company/rsa_key.priv
@end example
D will be connecting to C, which has a tincd running for this network on
port 2000. Hence they need to put in a ConnectPort, but it doesn't need
to have a different ListenPort.
port 2000. It knows the port number from the host configuration file.
On all hosts, in @file{/etc/tinc/company/hosts/BranchD}:
@example
Subnet = 10.4.0.0/16
Address = 4.5.6.7
-----BEGIN RSA PUBLIC KEY-----
...
-----END RSA PUBLIC KEY-----
@end example
@subsubheading Key files
A, B, C and D all have generate a public key with tincd -K, the output is
stored in /etc/tinc/hosts/X.pub (where X is A, B or D), except for C,
who stored it in /etc/tinc/A/hosts/C.pub.
A, B, C and D all have generated a public/private keypair with the following command:
A stores a copy of B's public key in /etc/tinc/hosts/B.pub
@example
tincd -n company -K
@end example
A stores a copy of C's public key in /etc/tinc/hosts/C.pub
B stores a copy of A's public key in /etc/tinc/hosts/A.pub
C stores a copy of A's public key in /etc/tinc/A/hosts/A.pub
C stores a copy of D's public key in /etc/tinc/A/hosts/D.pub
D stores a copy of C's public key in /etc/tinc/hosts/C.pub
The private key is stored in @file{/etc/tinc/company/rsa_key.priv},
the public key is put into the host configuration file in the @file{/etc/tinc/company/hosts/} directory.
During key generation, tinc automatically guesses the right filenames based on the -n option and
the Name directive in the @file{tinc.conf} file (if it is available).
@subsubheading Starting
A has to start their tincd first. Then come B and C, where C has to
provide the option `-n A', because they have more than one tinc
network. Finally, D's tincd is started.
After each branch has finished configuration and they have distributed
the host configuration files amongst them, they can start their tinc daemons.
They don't necessarily have to wait for the other branches to have started
their daemons, tinc will try connecting until they are available.
@c ==================================================================
@ -1207,11 +1208,11 @@ only, so keep an eye on it!
@table @strong
@item Could not open /dev/tap0: No such device
@table @bullet
@item You forgot to insmod netlink_dev.o
@item You forgot to insmod netlink_dev.o or ethertap.o
@item You forgot to compile `Netlink device emulation' in the kernel
@end table
@item Can't write to tun/tap device: No such device
@item Can't write to /dev/net/tun: No such device
@table @bullet
@item You forgot to insmod tun.o
@item You forgot to compile `Universal TUN/TAP driver' in the kernel