North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: RFC 1918
In message <[email protected]>, Bennett Todd writes: > >--u3W6riq+uV6J42Ub >Content-Type: text/plain; charset=us-ascii >Content-Disposition: inline > >2000-07-14-15:47:22 Steven M. Bellovin: >> No -- 1918 addresses would only break PMTU if folks did ingress or >> egress filtering for 1918 addresses. > >Wouldn't RFC 1918 addrs on router links only threaten to break >PMTU --- even in the face of 1918 addr filtering --- if one of >the routers with an rfc 1918 interface addr did routing between >interfaces with different MTUs? As best I can see, PMTU discovery >should work fine traversing RFC 1918 links, and the only addrs >that need to be passed on out are those of routers where the MTU >decreases along the path, which would only be routers with different >MTUs on different interfaces. Yup. And with most links handling 1500-byte MTUs or above, we don't see much of that. --Steve Bellovin
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