[swinog] Swisscom 6RD and MTU

2014-11-09 Thread Vincent Bernat
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: G... Kernel memory corrupted ... going on, but 
it'll crash very soon :-(\n");
2.4.3 linux/fs/hpfs/super.c


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Re: [swinog] Swisscom 6RD and MTU

2014-11-09 Thread Robert.Guentensperger
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: G... Kernel memory corrupted ... going on, but
> it'll crash very soon :-(\n");
> 2.4.3 linux/fs/hpfs/super.c
> 
> 
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> swinog mailing list
> swinog@lists.swinog.ch
> http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog

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