Maidak Alexander J wrote: >>> 1) Why does Solaris set the DF bit on all packets, even fragmented packets? >>> This seems odd to me. >> Path MTU discovery. See RFC 1191. >> >> Most modern systems do this. > > Solaris's behavior in setting the DF flag on all packets appears to be > somewhat unique.
That's not what I see on our networks, which have a mix of Solaris, Linux, Windows, AIX, HP/UX, and other odd systems. It could be that the ones you're looking at were specifically configured to disable Path MTU Discovery, or that the vendors added special tweaks to disable it just for NFS, or disable it for local traffic (which "presumably" doesn't traverse routers that can fragment), or (possibly) that they just support it only for TCP and not UDP due to implementation limitations. In any event, it's a standard mechanism, and is at least _fairly_ common. -- James Carlson 42.703N 71.076W <[email protected]> _______________________________________________ networking-discuss mailing list [email protected]
