Public bug reported:
Binary package hint: network-manager-vpnc
The network manger plugin for vpnc connections has the mtu (maximum
transmission unit) size hard coded in its sources. If one connects to a vpnc
concentrator with a mtu size lower than the one used by the plugin (1412) the
concentrator rejects all packages above this (its own) size.
One can only change the mtu size via "ifconfig tun0 mtu 1234" or by recompiling
the plugin with another mtu size. As it is possible to configure this value
while using vpnc directly it should be possible within the plugin too.
The mtu size is coded in "network-manager-vpnc-<VERSION>/src/nm-vpnc-
service-vpnc-helper.c" in line 371.
This bug affects all ubuntu versions (8.04 - 9.04). The source code
passage mentioned above is not valid for 8.04.
** Affects: network-manager-vpnc (Ubuntu)
Importance: Undecided
Status: New
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network-manager-vpnc has fixed mtu size for vpnc
https://bugs.launchpad.net/bugs/376340
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