[radvd-devel-l] radvd not responding to router solicitation?

[Thomas Novin]

Hi

I'm using IPv6 in my lan for a couple of months now. Dual-stack so not
very important for my clients.

I always get a note on the clients when connecting to a network that
there is no IPv6 router on the network, why is this?

A log from a Ubuntu 10.10 system connecting with NetworkManager.

(Connecting to a WiFi-network starting with a un-configured wlan0 using
nm-applet)

(Get's ipv4 DHCP via NetworkManager)

Mar 30 22:17:42 thonov-ubuntu kernel: [27531.008038] wlan0: no IPv6
routers present

$ sudo tcpdump -i wlan0 -n icmp6
tcpdump: verbose output suppressed, use -v or -vv for full protocol
decode
listening on wlan0, link-type EN10MB (Ethernet), capture size 65535
bytes
22:17:32.069118 IP6 :: > ff02::1:ff51:a85b: ICMP6, neighbor
solicitation, who has fe80::221:5cff:fe51:a85b, length 24
22:17:33.069125 IP6 fe80::221:5cff:fe51:a85b > ff02::2: ICMP6, router
solicitation, length 16
22:17:37.081133 IP6 fe80::221:5cff:fe51:a85b > ff02::2: ICMP6, router
solicitation, length 16
22:17:41.090222 IP6 fe80::221:5cff:fe51:a85b > ff02::2: ICMP6, router
solicitation, length 16

On the server, radvd doesn't respond to these, quite the opposit I feel
that it actually stops sending RA's for a while after seeing these
packets.

$ ip addr show dev wlan0
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP
qlen 1000
    link/ether 00:21:5c:51:a8:5b brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.39/24 brd 10.0.0.255 scope global wlan0
    inet6 fe80::221:5cff:fe51:a85b/64 scope link 
       valid_lft forever preferred_lft forever

Then after a while the server with radvd starts announcing again.

22:27:39.393213 IP6 fe80::226:5aff:fe14:7ff3 > ff02::1: ICMP6, router
advertisement, length 56
22:27:40.141101 IP6 :: > ff02::1:ff51:a85b: ICMP6, neighbor
solicitation, who has 2001:470:29:29a:221:5cff:fe51:a85b, length 24
22:27:44.207299 IP6 fe80::226:5aff:fe14:7ff3 > ff02::1: ICMP6, router
advertisement, length 56

Right away the client gets its IPv6 2001... address set.

$ ip addr show dev wlan0
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP
qlen 1000
    link/ether 00:21:5c:51:a8:5b brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.39/24 brd 10.0.0.255 scope global wlan0
    inet6 2001:470:29:29a:221:5cff:fe51:a85b/64 scope global dynamic 
       valid_lft 86400sec preferred_lft 14400sec
    inet6 fe80::221:5cff:fe51:a85b/64 scope link 
       valid_lft forever preferred_lft forever

Shouldn't radvd respond to these router solicitations? Can I configure
it to?

My radvd.conf:

interface eth1
{
   AdvSendAdvert on;
   MinRtrAdvInterval 3;
   MaxRtrAdvInterval 10;
   prefix 2001:470:29:29a::1/64
   {
        AdvOnLink on;
        AdvAutonomous on;
   };
};






-- 
Thomas Novin  - GPG/PGP ID CF62C14F