Specifications

Chapter 4 Troubleshooting
4.1.2 Review Manager Settings
For SNMP management software to connect to the GSW for management, the GSW/SNMP must be properly
configured with the manager's IP address and authorized for read/write (via community string setting) and trap
messages. Review the settings explained in 2.2.5 TCP/IP Configuration.
If the management workstation is on a remote network, ensure it can also pass the ping test.
Figure 4.2 Ipconfig and Ping Remote Network Device
Check with your network administrator to ensure that any firewalls in place will allow passing of SNMP protocol
in order to connect with an FRM on a remote network. By default SNMP uses port 161. Traps are unsolicited UDP
messages that are sent out port 162.
Always check all connections and double check all configurations. We have tested the FRM220A extensively
on local networks, on remote networks through bridges and routers and even over wireless links. You should not
experience any problems if you follow each and every step in this guide. We hope you enjoy using the FRM220A
with GSW/SNMP and web based GUI manager.
Trouble with NAT
Because SNMP uses UDP, NAT between networks will not allow forwarding packets unless specific port
forwarding rules are written into the firewall. If the GSW is on a public network and the manager workstation is
behind a NAT firewall, then there is no way for traps to reach the manager (the firewall will block them). The
alternative is to setup port forwarding on the network's firewall so that the traps on UDP port 162 are redirected to
the internal SNMP management workstation.
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