[lwip-users] RE: [lwip] dependeny of MSS on MTU

[Steve Langstaff]

If you were using BYTE stuffing then your comment about the packet size
doubling would be true.

If you are using BIT stuffing to replace e.g.

111111 with
1111101

then your maximum inflation will be 7/6.

--
Steve Langstaff.


-----Original Message-----
From: amol patel [mailto:address@hidden
Sent: 26 July 2002 10:18
To: address@hidden
Subject: [lwip] dependeny of MSS on MTU




Hi All!

   In lwip stack we r using bit stuffing mechanism for escape

sequences. In the worst case if we have to bit stuff all the

characters of a packet then the size of the resulting packet will be

double of the original packet which we must be able to send using the

datalink layer. Now if the  MSS * 2 > MTU we have to go for IP

fragmentation for which we have not included the code in lwip.

Is this implies that the size of the MSS should be 1/2 of the MTU to

avoid a situation like this?

Regards
Amol Patel



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