[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: Bug#239952: kernel-source-2.6.4: qla2xxx contains non-freefirmware

Tollef Fog Heen <tfheen@raw.no> wrote:
> How does the cable modem notify your box when the cable provider
> reboots the service and you get a new IP (or are they allocated
> statically, thereby bypassing the problem)?  In order to update DNS,
> IPv6 tunnels and such when the link goes up and down, I need to know
> about those changes.

The cable modem acts as an Ethernet bridge.  So it is not involved
at the IP level at all.

Unfortunately the only way to do this (for most ISPs) with external
ADSL modems is to use PPPoE, which means that you lose 8 bytes of
payload compared to what would happen if you used PPPoA with a PCI/USB
adapter (or the ADSL router itself, but as you know, this is suboptimal).

And don't underestimate its effect.  The problem is not the 8 bytes but
the stupid PMTU issues that arise out of it.  And no MSS-clamping is not
enough due to the presence of VPNs that your clamper may not be able
to decipher.
Debian GNU/Linux 3.0 is out! ( http://www.debian.org/ )
Email:  Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

Reply to: