Date: Fri, 15 Jun 2007 21:09:40 +0000 From: Poul-Henning Kamp <phk@phk.freebsd.dk> To: current@freebsd.org Subject: multicast not happy ? Message-ID: <1277.1181941780@critter.freebsd.dk>
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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 ?
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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