vpnc freezes computer with kernel 2.6.33-gentoo-r2, x86_64

[jblake20]

I am trouble trying to get vpnc to work on my laptop.

Using the same computer via Ubuntu, it works fine.

I used to use an older kernel with the cisco vpn client, but had to go through the motions of turning off cpus in order for it to work. I gave that trick a try and it does not work.

I pretty much followed the instructions from:
Gentoo Linux Documentation -- Gentoo vpnc HOWTO

The machine completely locks up right after I enter my password...

I don't see anything relevant in the /var/log/messages file.

Is there another log file to look into specific to the vpnc?

Any one have any suggestions....

Thanks

[jblake20]

Hi,

I am still trying to get VPNC to work on gentoo linux, kernel version 2.6.33, x86_64.


The problem occurs as soon as I enter the password and it tries to make its connection.

I am tailing the /var/log/messages and doing a dmesg command via a loop, and running tcpdump.

Here is what happens:

as root
> # vpnc
Password for VPN username@XXXXX@ipaddress
VPNC started in background (pid: 2344) ...
> #

System completely freezes

in dmesg output & logfile output I see:

[9309.539025] tun: Universal TUN/TAP device driver, 1.6
[9309.539027] tun: (C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>

tcpdump relatd output shows:
09:58:03.062988 IP computer.ipsec-nat-t > DestMachine.ipsec-nae-t: NONESP-encap: [|isakmp]
.
.
.
09:58:03.124601 IP DestMachine.ipsec-nae-t > computer.ipsec-nat-t: NONESP-encap: [|isakmp]
09:58:03.124746 IP computer.ipsec-nat-t > DestMachine.ipsec-nae-t: NONESP-encap: [|isakmp]
09:58:03.126574 IP DestMachine.ipsec-nae-t > computer.ipsec-nat-t: NONESP-encap: [|isakmp]
09:58:03.126727 IP computer.ipsec-nat-t > DestMachine.ipsec-nae-t: NONESP-encap: [|isakmp]
09:58:03.128784 IP computer.ipsec-nat-t > DestMachine.ipsec-nae-t: NONESP-encap: [|isakmp]

Can anyone tell me what to look for/what settings to check, etc.
What to check in kernel, what setting could be missed ? ? ?


Thanks !!!

Jamie

[chrislovecnm]

you find a fix by any chance?

[jblake20]

In order to get mine to work, I disabled configuration options that I previously set in the kernel for KVM:
unchecked Virtualization, left TUN/TAP as module, and unchecked bridging & Vlan support, see below.

Works now without crashing.

Also to note, I believe you must load TUN first before running vpnc
modprobe tun

[ ] Virtualization --->


# this needs to still be checked for VPNC, so I left that
Device Drivers --->[*] Network device support --->
<M> Universal TUN/TAP device driver support

Networking options --->
<*> 802.1d Ethernet Bridging │ │
│ │ <*> 802.1Q VLAN Support

[jblake20]

After connecting vpn using vpnc. I can not access the internet. My /etc/resolv.conf seems ok, but I am guessing there must be some addition routing that needs to be done.

Does anyone know how to do this?

Thanks