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Weird PPPoE behavior

timreck

I use a DSL modem which bridges traffic to the Sophos. The Sophos has a PPPoE interface and builds up the connection.

Yesterday I upgraded from a Sophos SG 105 to a 135, since then the PPPoE connections doesn't work anymore. I see many failed tries in the pppoe.log.

The weird thing: when I start using tcpdump on the ethernet interface,  I can see traffic and the pppoe negotiation gets successful. I've noticed this behavior many times.

Any ideas on this?



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  • 0 in reply to emmosophos

    Hi emmosophos,

    the output of the pppoe log:

    2020:06:16-21:30:18 atlantis pppd-pppoe[16814]: No response to 10 echo-requests
    2020:06:16-21:30:18 atlantis pppd-pppoe[16814]: Serial link appears to be disconnected.
    2020:06:16-21:30:18 atlantis pppd-pppoe[16814]: Connect time 4.1 minutes.
    2020:06:16-21:30:18 atlantis pppd-pppoe[16814]: Sent 910817 bytes, received 67335642 bytes.
    2020:06:16-21:30:18 atlantis pppd-pppoe[16814]: Script /etc/ppp/ip-down started (pid 17944)
    2020:06:16-21:30:18 atlantis pppd-pppoe[16814]: sent [LCP TermReq id=0x2 "Peer not responding"]
    2020:06:16-21:30:19 atlantis pppd-pppoe[16814]: Script /etc/ppp/ip-down finished (pid 17944), status = 0x0
    2020:06:16-21:30:21 atlantis pppd-pppoe[16814]: sent [LCP TermReq id=0x3 "Peer not responding"]
    2020:06:16-21:30:24 atlantis pppd-pppoe[16814]: Connection terminated.
    2020:06:16-21:30:24 atlantis pppd-pppoe[16814]: Modem hangup
    2020:06:16-21:30:24 atlantis pppd-pppoe[16814]: Exit.

    My modem has no MAC filtering, I can even see the right Sophos' MAC in its ARP Table.
    And as the mac of my modem didn't changed, I sure my ISP is not blocking any traffic because of some mac change.

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