On Sat, Oct 07, 2006 at 11:37:02PM +0100, Mark Rogers wrote:
If I use: wget -s http://www.more-solutions.co.uk/test.php?bytes=1276 .. I get a file of 1411 bytes (ie including HTTP headers etc). An MTU of 1458 means this is below the MTU with a bit of a margin, implying that the actual MTU limit should be lower still?
I am getting so confused!!
Can you use tcpdump (or ethereal, or whatever) to grab the entire packet on the remote server and also grab it on your local lan and see exactly how big it is?
Also, is this traffic going over real http or is it being encapsulated in the vpn stuff? As some vpns set do not fragment bits iirc, and when you add on the packet+vpn header+extra tcp header (or whatever) and you end up with a giant packet overall that can't be sent or won't fit through the link with out being repackaged but this then breaks the vpn (i think, I can't remember exactly what the mechanism is, but it is worth considering).
I think the first way forwards is both local and remote tcpdumps, if you can't work out the answer perhaps putting the dumps online would mean we could diagnose a bit for you?
Adam