Of course the GRE tunnel chops down the mtu size, so the highest I can perform the ping command (ping ip -f -l 1448) which when you add your 28 it comes to 1476 total. I can ping ip -l 1500 and get a ping response, though this packet is fragmented. An application works fine when plugged locally into SW1, but the system has problems when traversing the GRE tunnel because the MTU is chopped down. I have been trying to tell the sys admin that this is because the GRE tunnel chops down the MTU size and it seems his system does not handle fragmented packets. The fix has been to lower the MTU in regedit within the Windows box and everything works fine. He is not happy with this fix. He states that the system worked 2 weeks ago and now it does not work. He has not used it since then. He states no changes were made on his system. THe system uses UDP. I have only updated my IOS version on the 6509 to 12.2 SXF8. Keep in mind everything else but this one system is having issues within the network. Any idea or experience with a similar problem? Any comments would be appreciated. P.S. In this network I must run GRE tunnels, so that is not an option.
I don't have the ip tcp adjust-mss command in my 6509. I have a Sup720 card. How do I get this command. I do know that my tunnels are software switched. The only command that I have that is remotely like that is ip tcp mss in global config.
Ok, as a last trial, a workaround for these problems is to configure the IP sender to disable PMTUD. This causes the IP sender to send their datagrams with the DF flag clear. When the large packets reach the small-MTU router, that router fragments the packets into multiple smaller ones. The smaller, fragmented data reaches the destination where it is reassembled into the original large packet.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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