Nokia IP390 Installation Guide - Page 80

Problems with Multicast, Problems Interfacing to 1483 Devices, Problem, Solution

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Page 80 highlights

7 Troubleshooting 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. 80 IP390 Security Platform Installation Guide

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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.