Victor Sudakov wrote: > > If the MTU on the external Ethernet interface is 1500, it should be safe > to configure the gif(4) interfaces with mtu=1480 and gre(4) > interfaces with mtu=1476, correct? > > I've noticed that a newly created gre0 interface has the expected "mtu 1476" > value, but a newly created gif0 interface has "mtu 1280", why would the > default be so low? > > A second question. If the gif and gre tunnels will be wrapped in > IPSec transport mode, does it make sense to set the MTU on the > corresponding gif and gre interfaces to some lower value?
And to make the matter even more mysterious, if_ipsec(4) which is essentially the same as gif, is created by default with mtu=1400 for some reason. -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN 2:5005/49@fidonet http://vas.tomsk.ru/
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