Hi Folks, We've found in a couple of cases that ICMP packets coming from some address ranges (such as the WIX range 202.7.0.0/25) don't make it through GG. If those packets happen to be type 3 code 4 and the end user isn't capable of 1500 byte packets, you're certainly going to have MTU issues. Of course to diagnose the issue just do what Joe said. Cheers, Jon -----Original Message----- From: Joe Abley [mailto:jabley(a)ca.afilias.info] Sent: Friday, 3 August 2007 10:51 a.m. To: Scott Howard Cc: nznog(a)list.waikato.ac.nz Subject: Re: [nznog] global-gateway.net.nz and possible MTU problems On 2-Aug-2007, at 18:20, Scott Howard wrote:
We've got a client in Thailand who is having having trouble with traffic from a number of sites - all of which go through global- gateway.net.nz.
Based on the symptoms I'm guessing it may be an MTU issue (along with the other end blocking ICMP) - anyone seen this with global-gateway.net.nz before?
If anyone here is responsible for that network I'd appreciate it if you could contact me off-list.
Have you tried sending a series of packets between hosts over a network that traverses the bit of ggi that you think has the problem, setting the DF bit and increasing the payload size until they don't get through any more? Joe _______________________________________________ NZNOG mailing list NZNOG(a)list.waikato.ac.nz http://list.waikato.ac.nz/mailman/listinfo/nznog