[Vpn-help] MTU packet problems on Linux ...
Matthew Grooms
mgrooms at shrew.net
Wed Dec 12 17:11:55 CST 2007
Matthew Grooms wrote:
>
> I have been toying with the idea of making the virtual private network
> adapter use an MTU of 1480 bytes. This could potentially make most of
> these problems go away for the average user. Let me do some testing here
> locally and if things look good, I will post a build. Would you be able
> to test this for me with your adapter reset to the full 1500 byte MTU?
>
I guess the adapter MTU would need to decrease to around 1396 bytes.
1500
- 8 PPPOE Header
- 20 IP Header
- 8 UDP Header
- 16 ESP Header
- 32 ESP IV Data ( estimated max )
- 16 ESP Padding ( estimated max )
- 1 ESP Pad Bytes
- 1 Next Protocol
- 2 Round to nearest 4 bytes
----
1396
Some trial and error would probably be in order.
-Matthew
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