Hi Vincent, I've asked our 6rd Guru. This is related to our PPPoE-customers. Their MTU is reduced by another 8 Bytes because of the PPPoE header.
I hope this helps to clear the confusion. Regards, Günti > -----Original Message----- > From: swinog-boun...@lists.swinog.ch [mailto:swinog- > boun...@lists.swinog.ch] On Behalf Of Vincent Bernat > Sent: Sunday, November 09, 2014 12:33 PM > To: swinog@lists.swinog.ch > Subject: [swinog] Swisscom 6RD and MTU > > Hi! > > At home, I have replaced Swisscom internet box by my own (Linux) > router. For IPv6, I noticed that the MTU is 1472 instead of 1480 (1500 > - 20). For IPv4, MTU is 1500. > > Does anyone know why the MTU on those 6RD links has to be 1472 and not > 1480? Have other people with the same setup noticed that too? > -- > printk("HPFS: Grrrr... Kernel memory corrupted ... going on, but > it'll crash very soon :-(\n"); > 2.4.3 linux/fs/hpfs/super.c > > > _______________________________________________ > swinog mailing list > swinog@lists.swinog.ch > http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog
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