Date: Thu, 25 Mar 1999 10:36:01 -0800 From: Charles Henrich <henrich@flnet.com> To: freebsd-hackers@freebsd.org Subject: A Question about MTU and ICMP Need to Frag Message-ID: <19990325103601.C11010@orbit.flnet.com>
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I have a question.. I have a system with two interfaces fxp0 and fxp1, fxp1 is the external interface (to the world) fxp0 is the internal interface (net 10). If I alter the mtu on the external interface to something rediculous like 128 bytes, then connect to sites around the net, as far as I can tell, no ICMP need to frag packets are being generated (watching with tcpdump), but everything is working peachy keen. However, if I alter the mtu on the internal interface.. Connections out to the internet cause ICMP need to frag packets to be generated. The question I have is, shouldnt an ICMP need to frag packet be generated in all cases? If not, what magic is going on to get the outside world to talk in the smaller packet size? Thanks! -Crh Charles Henrich Manex Visual Effects henrich@flnet.com http://orbit.flnet.com/~henrich To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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