On 6/11/2013 17:01, Jiří Baum wrote:
Can anyone tell me what it means when I get the error message "Bogus
PPPoE length field (1502)" a few hundred times a day, usually in
bunches? Always the same number, 1502, never any other.
Have you tried negotiating a differently sized MTU to see if it changes
the length field displayed in the error message?
Also, it is possible that TPG support RFC 4638, [0] and your PPPoE
implementation doesn't understand that.
On a side note, while we're on the topic of MTUs -- changing the MTU
rarely has any effect. I recommend that you fix the MSS value on your
router, so your LAN clients don't hit the MTU limit.
Something like this out to do the trick:
# iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
-j TCPMSS --clamp-mss-to-pmtu
I'd be interested to see a full packet capture of the PPPoE negotiation
while it generates that error.
--
[0] https://tools.ietf.org/html/rfc4638
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