7 Troubleshooting
80 IP390 Security Platform Installation Guide
Problems with Multicast
Use tcpdump to view packets. To display packets for a specific interface, use the following
command: tcpdump
-i interface proto igmp
. For more information about how to use the
tcpdump command, see the Nokia Network Voyager Reference Guide.
Under Routing Options in the Routing Configuration section in Network Voyager, you can also
enable several types of trace options for DVMRP. These traces are logged into
/var/tmp/
ipsrd.log
.
For information about how to access Network Voyager and the related reference materials, see
“Using Nokia Network Voyager” on page 33.
Problem No IP connectivity.
Solution Verify that you have IP connectivity; ping various hosts on each network.
Problem DVMRP is not enabled on the interfaces.
Solution Verify that DVMRP is enabled on the interfaces in use.
Problem Exceeding TTL on clients.
Solution Verify that the client is set up for the proper TTL number. Many clients are set to
receive local traffic only one hop away.
Problems Interfacing to 1483 Devices
Problem Remote and local devices are not configured for the same VC and VP value.
Solution Set remote and local devices to the same VC and VP values. Consult your 1483
device documentation.
Problem Remote and local devices are not in the supported VC range of the NIC.
Solution Use
ipsctl
to determine the VC range. Enter the following command:
ipsctl ifphys:logical interface:max_rxlabel
Problem Encapsulation is not set to LLC/SNAP.
Solution Set encapsulation to LLC/SNAP. Consult your 1483 device documentation.
Problem The MTU size is not 1500 (for Ethernet interfaces) or 16018 (for Gigabit Ethernet
interfaces).
Solution The MTU size must be 1500 (for Ethernet interfaces) or 16018 (for Gigabit Ethernet
interfaces). Nokia does not support larger MTU sizes.
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