[Bloat] ipv6 not quite working for me on internal networks

[Simon Dalley]

Hello,

First, thanks for all the work to make cerowrt what it is.

I am having some difficulty with ipv6 on the "last hop", namely my internal
network.

Platform: Netgear WNDR3800
Cerowrt version: CeroWrt Toronto 3.10.50-1 / LuCI Trunk (svn-r10459)

AQUISS, my UK ISP, provides an ipv6 address range:
    IPv6 Address 20xx:xxxx:xx55:ae00::/56

Recommended MTU: 1458 bytes

I can make ipv6 work when connecting PC host "centaur" directly to the cable
modem and running pppd. ping6 ipv6.google.com etc works fine.

Reconnecting via the WNDR3800, everything ipv4 related works fine with
"centaur" on the se00 subnet.

I can also ping6 without problems from the WNDR3800:
  root at cerowrt:~# ping6 ipv6.google.com
  PING ipv6.google.com (2a00:1450:4009:80f::200e): 56 data bytes
  64 bytes from 2a00:1450:4009:80f::200e: seq=0 ttl=53 time=15.576 ms
  64 bytes from 2a00:1450:4009:80f::200e: seq=1 ttl=53 time=14.959 ms
  64 bytes from 2a00:1450:4009:80f::200e: seq=2 ttl=53 time=15.156 ms
  64 bytes from 2a00:1450:4009:80f::200e: seq=3 ttl=53 time=15.044 ms
  ^C
  --- ipv6.google.com ping statistics ---
  4 packets transmitted, 4 packets received, 0% packet loss
  round-trip min/avg/max = 14.959/15.183/15.576 ms

but ping6 can't get through from centaur on se00:
  root at centaur:/etc/network# ping6 ipv6.google.com
  PING ipv6.google.com(lhr25s02-in-x200e.1e100.net) 56 data bytes
  From lhr25s02-in-x200e.1e100.net icmp_seq=1 Destination unreachable: No
route
  From lhr25s02-in-x200e.1e100.net icmp_seq=2 Destination unreachable: No
route
  From lhr25s02-in-x200e.1e100.net icmp_seq=3 Destination unreachable: No
route
  From lhr25s02-in-x200e.1e100.net icmp_seq=4 Destination unreachable: No
route
  ^C
  --- ipv6.google.com ping statistics ---
  4 packets transmitted, 0 received, +4 errors, 100% packet loss, time
3024ms

For your information, ipv6 routes on centaur are:
  root at centaur:/etc/network# ip -6 route
  20xx:xxxx:xx55:ae10::f48 dev eth0  proto kernel  metric 256  expires
84847sec pref medium
  20xx:xxxx:xx55:ae10::/64 dev eth0  proto ra  metric 100  pref medium
  20xx:xxxx:xx55:ae00::/56 via fe80::2cb0:5dff:fea6:94ad dev eth0  proto
ra  metric 100  pref medium
  fe80::/64 dev eth0  proto kernel  metric 256  pref medium
  default via fe80::2cb0:5dff:fea6:94ad dev eth0  proto static  metric 100
pref medium

and on the router are:
  root at cerowrt:~# ip -6 route
  default from :: via fe80::f60f:1bff:fe17:8d00 dev pppoe-ge00  proto
static  metric 1024
  default from 20:xx:xxxx:xx00:55ae::/64 via fe80::f60f:1bff:fe17:8d00 dev
pppoe-ge00  proto static  metric 1024
  20xx:xxxx:xx55:ae00::/64 dev gw00  proto kernel  metric 256
  20xx:xxxx:xx55:ae01::/64 dev gw10  proto kernel  metric 256
  20xx:xxxx:xx55:ae02::/64 dev sw00  proto kernel  metric 256
  20xx:xxxx:xx55:ae03::/64 dev sw10  proto kernel  metric 256
  20xx:xxxx:xx55:ae10::/60 dev se00  proto kernel  metric 256
  unreachable 20xx:xxxx:xx55:ae00::/56 dev lo  proto static  metric
2147483647  error -128
  fe80::/64 dev se00  proto kernel  metric 256
  fe80::/64 dev ifb0  proto kernel  metric 256
  fe80::/64 dev sw10  proto kernel  metric 256
  fe80::/64 dev sw00  proto kernel  metric 256
  fe80::/64 dev gw10  proto kernel  metric 256
  fe80::/64 dev gw00  proto kernel  metric 256
  fe80::/64 dev ge00  proto kernel  metric 256
  fe80::/10 dev pppoe-ge00  metric 1
  fe80::/10 dev pppoe-ge00  proto kernel  metric 256

I'm stumped. Can anybody help?

regards, Simon
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