Hello -- How can I get NetBSD 10 to obey the MTU size advertised by my
OpenBSD router advertisement daemon?
On OpenBSD, /etc/rad.conf has
mtu 1480
On NetBSD, my interface MTU is still 1500.
It's a rockpro64 awge interface running NetBSD 10.1 GENERIC64.
Note: I need to set MTU because I use tunnelbroker.net, which has a max
MTU of 1480. IPv6 and MTU can be cranky, especially through a tunnel.
tcpdump -vvv -A from OpenBSD of the RA to NetBSD:
fe80::8647:9ff:fe2d:eeec > fe80::2480:27ff:fedf:b6ae: icmp6: router
advertisement(chlim=0, pref=medium, router_ltime=1800, reachable_time=0,
retrans_time=0)(src lladdr: 84:47:09:2d:ee:ec)(prefix info: LA
valid_ltime=5400, preferred_ltime=2700,
prefix=2001:470:e833:1ab::/64)[ndp opt] (len 120, hlim 255)
Thanks - Joel
