[Bug 1110787] Re: VPN tunnel connections are not properly setting MTU values
I am still seeing this problem in 14.10, even installed fresh on a new
laptop. I have found a workaround that takes care of the problem
automatically, though. There is a 1412 mtu hardcoded in /etc/vpnc/vpnc-
script, but that may not be relevant to network manager so I didn't mess
with that script. The NetworkManager man page notes that any scripts
placed in /etc/NetworkManager/dispatcher.d will run when network
connections go up and down, and that they will receive the name of the
interface and the action as parameters to the script. So I placed the
following script in that directory under the name 70vpnMtuCorrection
(the scripts run in alpha order, and there was already one more there so
I wanted this one to run later...but you can call it anything else you
like and it should still work). The script needs to be owned by root and
executable by all (so use sudo to save it and execute a chmod a+x on
the file). The script determines if the tun0 interface is coming up, if
we have a wlan0 connection, calculates the necessary mtu value, and
resets it if the MTU value needs to be decreased. This seems to be
handling my issue, but I would still prefer to see that it is handled
properly by network manager in the first place. But if you are having
the same problem, this should remove a pesky annoyance like it is doing
for me:
/etc/vpnc/vpnc-script/70vpnMtuCorrection:
#!/bin/bash
TUN0_INTERFACE_NAME=tun0
WLAN0_INTERFACE_NAME=wlan0
VPN_UP_ACTION_NAME=vpn-up
MTU_DIFFERENCE=78
INTERFACE_NAME=${1}
ACTION=${2}
if [ ${INTERFACE_NAME} != ${TUN0_INTERFACE_NAME} ]
then
exit 0
fi
if [ ${ACTION} != ${VPN_UP_ACTION_NAME}]
then
exit 0
fi
#Make sure we have a current TUN0 entry before we continue.
CURRENT_TUN0_MTU=`sudo ip link list | grep ${TUN0_INTERFACE_NAME}: | sed -r
s/.*mtu ([0-9]+).*/\1/`
if [ ${WLAN_MTU} == }
then
exit 0
fi
#Also make sure we have a current WLAN0 entry
WLAN_MTU=`sudo ip link list | grep ${WLAN0_INTERFACE_NAME}: | sed -r s/.*mtu
([0-9]+).*/\1/`
if [ ${WLAN_MTU} == }
then
exit 0
fi
NEW_TUN0_MTU=$((${WLAN_MTU} - ${MTU_DIFFERENCE}))
if [ ${NEW_TUN0_MTU} = ${CURRENT_TUN0_MTU} ]
then
exit 0
fi
ip link set ${TUN0_INTERFACE_NAME} mtu ${NEW_TUN0_MTU}
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1110787
Title:
VPN tunnel connections are not properly setting MTU values
To manage notifications about this bug go to:
https://bugs.launchpad.net/network-manager/+bug/1110787/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1110787] Re: VPN tunnel connections are not properly setting MTU values
also affects network-manager 0.9.8.8-0ubuntu7 with network-manager-vpnc 0.9.8.6-1ubuntu2 ** Also affects: network-manager Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1110787 Title: VPN tunnel connections are not properly setting MTU values To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1110787/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1110787] Re: VPN tunnel connections are not properly setting MTU values
Status changed to 'Confirmed' because the bug affects multiple users. ** Changed in: network-manager (Ubuntu) Status: New = Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1110787 Title: VPN tunnel connections are not properly setting MTU values To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1110787/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1110787] Re: VPN tunnel connections are not properly setting MTU values
** Package changed: ubuntu = network-manager (Ubuntu) ** Tags added: quantal -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1110787 Title: VPN tunnel connections are not properly setting MTU values To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1110787/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1110787] Re: VPN tunnel connections are not properly setting MTU values
Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode. To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1110787/+editstatus and add the package name in the text box next to the word Package. [This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.] ** Tags added: bot-comment -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1110787 Title: VPN tunnel connections are not properly setting MTU values To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1110787/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
