A followup to myself:
> I'm trying to debug ADSL/PPPoE here. The client is getting connected,
> authenticated, and can ping the router. One would think that everything
> is just great. But: If I try to ping anything other than the router
> itself from the client, I don't get PPPoE packets back, instead I get
> packets with ethertype 0x81f1.
>
> Here's a ping from the client to the router itself (this works):
>
> 00:49:54.378180 0:60:8:62:23:af 0:50:b:b2:44:38 8864 106: PPPoE [ses 0x1] 195.204.234.1 > 194.19.1.211: icmp: echo request
> 00:49:54.387705 0:50:b:b2:44:38 0:60:8:62:23:af 8864 106: PPPoE [ses 0x1] 194.19.1.211 > 195.204.234.1: icmp: echo reply
>
> Here's a ping from the client to a host reachable via the router:
>
> 00:50:00.657542 0:60:8:62:23:af 0:50:b:b2:44:38 8864 106: PPPoE [ses 0x1] 195.204.234.1 > 129.241.1.16: icmp: echo request
> 00:50:00.675143 0:0:3a:1:d2:60 45:0:0:54:7d:79 81f1 84:
> 0110 c3cc 0040 0000 2a6d 3801 0000 184c
> 423b 4e07 0a00 0809 0a0b 0c0d 0e0f 1011
> 1213 1415 1617 1819 1a1b 1c1d 1e1f 2021
> 2223 2425 2627 2829 2a2b 2c2d 2e2f 3031
> 3233 3435 3637
This appears to be a CEF related problem in 12.1(5)T. Turning off CEF
(globally) fixes the problem. Switching to 12.2(1) also fixes the problem.
Steinar Haug, Nethelp consulting, sthaug@nethelp.no
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