Using the same IP subnet on the VERITAS Cluster Server Public network adapter and on both Cluster Server Heartbeat adapters can cause IP routing problems when the adapters are not on the same physical network.
| Article:TECH19072 | | | Created: 2002-01-18 | | | Updated: 2005-01-28 | | | Article URL http://www.symantec.com/docs/TECH19072 |
Problem
Using the same IP subnet on the VERITAS Cluster Server Public network adapter and on both Cluster Server Heartbeat adapters can cause IP routing problems when the adapters are not on the same physical network.
Solution
Using the same IP subnet on the VERITAS Cluster Server
Public network adapter (Figure 1) and on both Cluster Server Heartbeat adapters
(Figure 2) can cause IP routing problems when the adapters are not on the same
physical network.
Figure 1
Figure 2 (For simplicity, only the Heartbeat with the highest host ID is shown.)
Figure 1
Figure 2 (For simplicity, only the Heartbeat with the highest host ID is shown.)
The problem
occurs when a virtual IP address is brought online and it forces the routing
engine to recalculate the IP routing table. When the routing engine has
more than one path to a defined default gateway, it selects the path that has
the highest host ID for that subnet (Figure 3 and 4). If the heartbeat
card has the highest IP address for that subnet, it is selected as the route to
the default gateway though it has no physical path to the default
gateway. See Microsoft Knowledge Base Article "Expected Behavior of
Multiple Adapters on Same Network" (Q175767) for details
Figure
3
Figure 4
(For simplicity, only the Heartbeat with the highest host ID is
shown.)
Workaround
Assign a
different IP subnet to each of the Heartbeat networks and to the Public network
(minimum of three IP subnets are required)
- Or -
Disable IP from
each of the Heartbeat network adaptors*
*VERITAS
Cluster Server does not require IP for the Heartbeat network.
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Legacy ID
245717
Article URL http://www.symantec.com/docs/TECH19072
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