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The route configuration of the NAS node is incorrect causes can’t access across network segment

Publication Date:  2012-11-27 Views:  45 Downloads:  0
Issue Description
While delivering the NAS site, the configuration of the switch connected with the NAS node directly has been modified, after testing, we find the PC can’t access the NAS service across network segment (not in the same segment with the NAS node), and it can’t ping through.

Alarm Information
None
Handling Process
Add the default route in the node, and then it displays as followed:
Destination        Gateway               Genmask         Flags    MSS Window    irtt Iface
192.168.250.0   0.0.0.0               255.255.255.0     U           0 0                  0 bond0
172.20.9.0          0.0.0.0               255.255.255.0     U           0 0                  0 priveth0
127.0.0.0            0.0.0.0                255.0.0.0              U           0 0                  0 lo
0.0.0.0             192.168.250.254  0.0.0.0               UG           0 0                  0 bond0

Through testing and validating, and it’s OK.

Root Cause
1. We just have modified the switch’s configuration, we guess it may be the configuration’s problem, check it repeatedly, and there isn’t any problem.
2. In the switch which connected directly with the NAS node, we can’t ping through the NAS node’s IP;
3. Distribute a PC into the same VLAN which the NAS node is in, the PC which is across the network segment can ping through this PC;
From the above, we conclude the network hasn’t problem, it must be problem of the NAS node’s IP or the route configuration. After view the route of the NAS node configuration, we find there isn’t the default route, which causes the PC in the same segment can communicate with the NAS, but can’t communicate across the network segment.
The route in the node is configured as the following:
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
192.168.250.0   0.0.0.0         255.255.255.0    U           0 0                 0 bond0
172.20.9.0          0.0.0.0         255.255.255.0     U          0 0                0 priveth0
127.0.0.0            0.0.0.0         255.0.0.0              U          0 0                 0 lo

Suggestions
None

END