Re: multicast not happy ?

Poul-Henning Kamp wrote:
> I set up a really simple network here, two boxes with two 
> cross-over ethernets:
> 
>         10.1.0.1/24 ------------- 10.1.0.2/24
>      A						B
>         10.2.0.1/24 ------------- 10.2.0.2/24
> 
> Ipforwarding is enabled on both, and "routed" is running with
> /etc/gateways containing:
> 
> 	ripv2
> 	no_solicit
> 	no_rdisc_adv
> 
> And nothing happens at all...
> 
> routed in both ends complain about:
> 
> 	routed: Send mcast sendto(sis2, 224.0.0.9.520): Network is unreachable
> 	routed: Send mcast sendto(sis1, 224.0.0.9.520): Network is unreachable
> 
> Running a tcpdump on one end, the IGMP reports to the new MCast are
> sent:
> 
>     syv# tcpdump -i vr1 -n -s 2000 -v
>     tcpdump: listening on vr1, link-type EN10MB (Ethernet),
> 	capture size 2000 bytes
>     20:35:24.738693 IP (tos 0x0, ttl   1, id 11501, offset 0,
> 	flags [none], proto: IGMP (2), length: 32, options ( RA
> 	(148) len 4 )) 10.1.0.1 > 224.0.0.9:
> 	igmp v2 report 224.0.0.9
> 
>     20:35:25.118284 IP (tos 0x0, ttl   1, id 118, offset 0,
> 	flags [none], proto: IGMP (2), length: 32, options ( RA
> 	(148) len 4 )) 10.1.0.2 > 224.0.0.9: igmp v2 report 224.0.0.9
> 
> But no further trafic is sent.
> 
> Netstat -ian shows the mcast groups joined:
> 
> vr1    1500 <Link#2>      00:00:24:08:62:ed       25     0        8     0     0
>                           01:00:5e:00:00:09       23              7
>                           01:00:5e:00:00:01       23              7
> vr1    1500 10.1.0.0/24   10.1.0.1                17     -        7     -     -
>                           224.0.0.9        
>                           224.0.0.1        
> vr2    1500 <Link#3>      00:00:24:08:62:ee       28     0        9     0     0
>                           01:00:5e:00:00:09       26              7
>                           01:00:5e:00:00:01       26              7
> vr2    1500 10.2.0.0/24   10.2.0.1                17     -        7     -     -
>                           224.0.0.9        
>                           224.0.0.1        
> 
> as does ifmcstat:
> vr1:
>         inet 10.1.0.1
>                 group 224.0.0.9
>                         igmpv2
>                         mcast-macaddr 01:00:5e:00:00:09 refcnt 1
>                 group 224.0.0.1
>                         mcast-macaddr 01:00:5e:00:00:01 refcnt 1
> vr2:
>         inet 10.2.0.1
>                 group 224.0.0.9
>                         igmpv2
>                         mcast-macaddr 01:00:5e:00:00:09 refcnt 1
>                 group 224.0.0.1
>                         mcast-macaddr 01:00:5e:00:00:01 refcnt 1
> 
> Any ideas ?
> 

# /sbin/route add -static -net 224.0.0.0 -netmask 240.0.0.0 -iface sis[1|2]

I had to do this so my OpenSlp would work.

jmc