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kern/50031: PPPoE server fails to work on -7

>Number:         50031
>Category:       kern
>Synopsis:       PPPoE server fails to work on -7
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jul 04 08:50:00 +0000 2015
>Originator:     Roy Marples
>Release:        NetBSD-7.0_RC1
NetBSD 7.99.18 NetBSD 7.99.18 (ERLITE) #3: Tue Jun 16 13:47:35 BST 2015 evbmips
PPPoE server fails to work on -7 and -current.
95% sure the same config worked on -6.
tcpdump reports PADI packets arrive, but nothing is returned and no diagnostic is logged.

1) Setup a PPPoE server as noted here:

2) Note it fails to work.

Here are some configs:

erlite$ strings /boot/netbsd.elf32 | grep PPPOE

erlite$ sudo cat /etc/ifconfig.pppoe1
# Server
! /sbin/pppoectl -e cnmac2 $int
! /sbin/pppoectl $int hisauthproto=pap hisauthname='' hisauthsecret='oink' myauthproto=none up

erlite$ sudo pppoectl -v pppoe1
pppoe1: phase=dead
        hisauthproto=pap hisauthname=""
        lcp timeout: 1.000 s
        idle timeout = disabled
        max-auth-failure = 5
        max-noreceive = 15 seconds
        max-alive-missed = 3 unanswered echo requests

erlite$ ifconfig pppoe1
pppoe1: flags=9811<UP,POINTOPOINT,SIMPLEX,LINK0,MULTICAST> mtu 1492
        inet -> netmask 0xff000000
        inet6 fe80::618:d6ff:fef0:2cb%pppoe1 ->  prefixlen 64 scopeid 0x8

erlite$ ifconfig cnmac2
        address: 04:18:d6:f0:02:cd
        media: Ethernet autoselect (100baseTX full-duplex,flowcontrol,rxpause,txpause)
        status: active
        inet netmask 0xffffff00 broadcast


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