Novell NETWARE 6, Руководство пользователя

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Internetwork Packet Exchange
Internetwork Packet Exchange
103-000176-001
August 29, 2001
Novell Confidential
Manual 99a
38
July 17, 2001
3b
Use IPXPING to check all routers or servers in the end-to-end path
(do this from one side only). Also, check the end points.
If connectivity is occurring from a workstation, make sure that the
workstation can log in to the first server or router in the path or that
it has access through the router in question.
If the connectivity loss is only temporary (for example, you
occasionally get abort retries on the workstation), then let IPXPING
run for several minutes. Check for packet loss during this time, then
examine the router at which packet loss occurred.
It is also possible that a router is malfunctioning in the end-to-end
path. Usually, IPXPING can help you determine where the fault is
occurring.
3c
Once you have found the router that has the problem, check its
potential paths.
All downstream routes from the first router to the router that has the
problem should also be potential paths on this router. If this is not the
case and the router does not quickly acquire the downstream routes,
then the system probably has a software error in it. Contact the router
manufacturer's technical support for further assistance. To help
minimize problems like this, you should purchase only NLSP-
certified routers.
4
If connectivity loss occurs outside an NLSP area, check each router in the
end-to-end path for an external RIP route.
RIP can be used between NLSP areas. Therefore, it is necessary to check
the end-to-end path in a more tedious way, as follows:
4a
Find the next-hop router from each of the servers.
4b
Look at that system's forwarding database.
4c
Find the next-hop router from that system, and so on, until you have
found where the route leads. Do the same from the other side of the
path as well.
This process is difficult with the current implementation of RIP and
SNMP for Novell, because RIP shows only the next-hop LAN and
Network Interface Card (NIC) address (over LANs) instead of the
internal network number of the system. SNMP cannot receive
packets that are addressed to a NIC; the packets must be addressed to
the internal network number. You must work backward, first finding
all routers attached to the LAN, and then finding the receiving LAN