jonathan f4c2260f8a Make if_loop MTU settable via SIOCSFMTU/ifconfig. Useful for testing,
and for regression-testing performance at various MTUs.

NB: route MTU may not track MTU changes, which may cause problems for
AF_ISO if loopback MTU is decreased. I've never seen problems with IP,
in various tests going back to around NetBSD 1.3.
2003-08-15 19:22:08 +00:00
..
2003-08-13 19:44:12 +00:00
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