On Wednesday, 2004-12-29 at 17:04 EST, Joe Abley <[EMAIL PROTECTED]> wrote: > On 29 Dec 2004, at 16:33, Tony Rall wrote: > > But that only affects tcp traffic - it does nothing to help other > > protocols. > > Are there any common examples of the DF bit being set on non-TCP > packets?
Common? It depends on what you're doing. To some people, the only common application is 80/tcp. Remember that the DF bit is in the IP header - it can be on in any protocol. I know that AIX and my old RH Linux (at least) defaults to PMTUD enabled for tcp and udp. You can even see it in dns lookups. > > The better solution is to ensure that PMTUD works correctly for your > > network, and get on the case of any correspondent or provider for > > which it doesn't. > > Making sure that pMTUd works in your own network doesn't solve the > problem. You need to make sure it works properly in every other network > with which you ever might want to exchange a 1500-byte packet. I thought that's what I just said. Tony Rall
