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arch-wiki-md-repo

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All arch-wiki articles in markdown format, updated every two days.

github.com/greg-js/arch-wiki-md-repo

greg-js/arch-wiki-md-repo

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[vpnc](https://www.unix-ag.uni-kl.de/~massar/vpnc/) is a VPN client for Cisco hardware VPNs. ## Contents * [1 Installation](#Installation) * [2 Configuration](#Configuration) * [3 Starting](#Starting) * [4 Troubleshooting](#Troubleshooting) ## Installation [Install](/index.php/Install "Install") the [vpnc](https://www.archlinux.org/packages/?name=vpnc) package. ## Configuration The vpnc configuration files are in `/etc/vpnc`. It contains a `default.conf` file that you can copy and modify for your setup. Executing `vpnc --long-help` will provide the names and descriptions of the various configuration options. For instance, in that output you will see ``` --gateway <ip/hostname> IP/name of your IPSec gateway conf-variable: IPSec gateway<ip/hostname> ``` which translates into a line like this in your configuration file: ``` IPSec gateway gateway.example.com ``` ## Starting The `vpnc` package comes with a [systemd](/index.php/Systemd#Using_units "Systemd") unit `vpnc@.service`. If you want to use the configuration file `/etc/vpnc/client.conf`, you would start it with `systemctl start vpnc@client`. ## Troubleshooting In case the vpnc client crashes with: ``` May 15 09:11:38 ntrp-mimacom systemd-coredump[5858]: Process 5814 (vpnc) of user 0 dumped core. Stack trace of thread 5814: #0 0x00007f835cba3a10 raise (libc.so.6) #1 0x00007f835cba513a abort (libc.so.6) #2 0x00007f835cb9c607 __assert_fail_base (libc.so.6) #3 0x00007f835cb9c6b2 __assert_fail (libc.so.6) #4 0x000000000040e48c n/a (vpnc) #5 0x0000000000412348 n/a (vpnc) #6 0x0000000000404f72 n/a (vpnc) #7 0x00007f835cb90511 __libc_start_main (libc.so.6) #8 0x000000000040596a n/a (vpnc) ``` you will need to monkey patch the the software because an assertion is failing with the latest updates.. Download the sources from [http://svn.unix-ag.uni-kl.de/vpnc/trunk/](http://svn.unix-ag.uni-kl.de/vpnc/trunk/) and patch the file vpnc.c with the following: ``` Index: vpnc.c =================================================================== --- vpnc.c (revision 550) +++ vpnc.c (working copy) @@ -1206,7 +1206,7 @@ assert(a->af == isakmp_attr_16); assert(a->u.attr_16 == IKE_LIFE_TYPE_SECONDS || a->u.attr_16 == IKE_LIFE_TYPE_K); assert(a->next != NULL); - assert(a->next->type == IKE_ATTRIB_LIFE_DURATION); + /* assert(a->next->type == IKE_ATTRIB_LIFE_DURATION); */ if (a->next->af == isakmp_attr_16) value = a->next->u.attr_16; ``` Temporary workaround found here: [https://bbs.archlinux.org/viewtopic.php?id=225556](https://bbs.archlinux.org/viewtopic.php?id=225556) Remember to change the PREFIX to /user instead /user/local so you overwrite the broken binary.