7 — Troubleshooting network management LAN issues
7-4 Alcatel-Lucent 5620 Service Aware Manager, Release
Troubleshooting Guide 3HE 05723 TQZZA Edition 01
Procedure 7-3 Problem: Another machine can be pinged, but some
functions are unavailable
Check the following to determine whether port availability or routing is the cause of
management domain LAN issues:
• ports that need to be open across firewalls
• routing using netstat and ARP
1 The 5620 SAM uses numerous TCP and UDP ports for communication between
various services. Some of these ports, such as the SNMP trap port, are configured
during installation. Other ports are configured automatically by the software.
Check that these ports are open or protected by a firewall, depending on system
architecture needs.
The complete list of ports, their use, and the default port numbers are listed in
the firewall section of the 5620 SAM Planning Guide.
2 Run the following to check routing information.
i Open a DOS shell or command tool on the PC or workstation.
ii Run a trace route command to determine the path taken to a destination by
sending an ICMP echo request message.
• Type tracert on a Windows PC
• Type traceroute on a Solaris workstation
The path displayed is the list of near-side interfaces in the path between a
source host and a destination machine. The near-side interface is the
interface closest to the source host.
iii Run the netstat -r and arp -a commands to display active TCP connections,
Ethernet statistics, the IP routing table, and the ports on which the PC or
workstation is listening.
Procedure 7-4 Problem: Packet size and fragmentation issues
Large packet sizes from the managed devices are being dropped by intermediate
routers because the packets exceed the device MTU or the devices are not configured
to forward fragmented packets, causing resynchronizations to fail. The
5620 SAM-managed devices are configured to send SNMP packets of up to 9216 bytes.
The 5620 SAM is typically configured to accept large SNMP packets.
Note — Track any changes to port configuration values for future
reference.
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