[ClusterLabs] Antw: Regarding IP tables and IP Address clone

[Somanath Jeeva]

> Am Mittwoch, 23. Dezember 2015, 12:28:06 schrieb Ulrich Windl:

> >>> Somanath Jeeva <somanath.jeeva at ericsson.com<http://clusterlabs.org/mailman/listinfo/users>> schrieb am 23.12.2015 um

> >>> 06:01 in

> Nachricht <4F5E5141ED95FF45B3128F3C7B1B2A6721ABE07B at eusaamb109.ericsson.se<http://clusterlabs.org/mailman/listinfo/users>>:

> > Hi ,

> >

> > Thanks for the quick reply.

> >

> > I will check with our IT team regarding the multicast MAC at switch level.

> >

> > But the Virtual IP is reachable for 15 minutes or so after I start the

> > pacemaker/Corosync service. After which it becomes unreachable. However

> > when I restart the iptables service it becomes reachable again for

> > another 15 min.

> It could be some ARP cache problem. Maybe watch it.



> Please check the ARP tables of your switches / routers. IP address clones use

> multicast MAC addresses for the unicast IP address. Some switches (esp Cisco)

> do not like that. You would have to configure the MAC addresses manually.



Do I have to configure this MAC address manually at switch level?. The Multicast MAC was automatically added in the iptables after started the pacemaker/Corosync service.



# service iptables status

Table: filter

Chain INPUT (policy ACCEPT)

num  target     prot opt source               destination

1    CLUSTERIP  all  --  0.0.0.0/0            10.61.150.55        CLUSTERIP hashmode=sourceip clustermac=51:33:83:16:0A:BF total_nodes=2 local_node=1 hash_init=0

2    ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0



Chain FORWARD (policy ACCEPT)

num  target     prot opt source               destination



Chain OUTPUT (policy ACCEPT)

num  target     prot opt source               destination

1    ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0



> Mit freundlichen Grüßen,



> Michael Schwartzkopff


With Regards
Somanath Thilak J

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