[Linux-ha-dev] problems to setup a cluster with more than two nodes on OpenBSD

[Andrew W. Nosenko]

On 10/19/07, Sebastian Reitenbach <sebastia at l00-bugdead-prods.de> wrote:
> ok, then I tried to use multicast, like in this configuration:
> autojoin any
> crm yes
> compression bz2
> use_logd on
> deadtime 15
> initdead 40
> keepalive 2
> node defiant.ds9 biggame.ds9 warbird.ds9
> udpport 6666
> #mcast fxp0 224.0.0.1 609 2 0
> ping 10.0.0.1 10.11.0.1
> debug true
> cluster OpenBSD-Heartbeat
>
> but with that configuration, I saw that in the logfiles:
> Oct 19 17:31:11 defiant heartbeat: [23845]: ERROR: write failure on mcast
> fxp0.: Host is down
> Oct 19 17:31:13 defiant heartbeat: [23845]: ERROR: glib: Unable to send
> mcast packet [-1]: Host is down

[skip]

> The interface has the MULTICAST flag set:
> fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         lladdr 00:0e:7b:fc:c0:a0
>         groups: egress
>         media: Ethernet autoselect (100baseTX full-duplex)
>         status: active
>         inet6 fe80::20e:7bff:fefc:c0a0%fxp0 prefixlen 64 scopeid 0x2
>         inet 10.0.0.5 netmask 0xffffff00 broadcast 10.0.0.255

Multicast traffic may be filtered/dropped by some firewall, or router, or...
It would be good idea to check whether your machines receive multicast
packets using tcpdump (e.g. using "tcpdump -vl ip multicast") or some
another tool at your taste.

-- 
Andrew W. Nosenko <andrew.w.nosenko at gmail.com>