Public bug reported:
Binary package hint: ppp
When I log on to a certain VPN of type "Microsoft VPN (PPTP)", the
connection is always dropped after some time. It turns out that this
happens when my computer sends a GRE-encapsulated PPP packet with a
payload length of 1417. The MTU of the network interface ppp0 is 1412. I
believe the VPN gateway accepts packets with a payload length up to
1416. (How can I verify that?)
I am not sure whether pptp or pppd is the culprit here, but I suspect
pppd. This looks like an off-by-one error.
Does anyone know why this might happen? Any pointers where I might look?
Is there any information I can provide you with?
I am using Ubuntu 8.04 "hardy heron" with ppp 2.4.4rel-9ubuntu2.
** Affects: ppp (Ubuntu)
Importance: Undecided
Status: New
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pppd sends packets exceeding MTU
https://bugs.launchpad.net/bugs/317567
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