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  3. March 2007

Re: Traceroute?

Hi!

You most probably have either of these problems:

One heavily loaded server (in terms of network traffic)
An assymetrical route setup (packets are routed via different routers when going in different directions) 
A packet filter/firewall on one server (or router)
No DNS name on one or more routers/hosts
If you have a packet filter, one server or router blocks the traceroute packets and the timeout gives the long trace times.
Could you copy the results from both traces and post here? The easiest way to see the results is to first traceroute and then run DSPJOBLOG. 

Example:

traceroute '193.0.0.193'
Probing possible routes to 193.0.0.193 using *ANY interface.
1 192-168-1-5.varberg.net (192.168.1.5) 7.15 0.896 1.66
2 2.varbergkabel-net01c.varberg.ne (217.73.102.2) 3.00 2.76 1.66
3 17.229.88.213.host.songnetworks. (213.88.229.17) 2.02 6.15 3.61
4 fe0-0-200.cty-pe1.vbg.se.sn.net (213.88.164.205) 2.81 1.82 3.05
5 ge0-0-0.joo.peer1.ams.nl.sn.net (62.95.54.113) 17.9 17.7 18.0
6 ge0-0-0.joo.peer1.ams.nl.sn.net (62.95.54.113) 18.0 17.8 18.4
7 Amsterdam1.ripe.net (195.69.144.68) 21.1 20.0 19.7
8 ns.ripe.net (193.0.0.193) 18.7 18.7 19.8
I'm not sure I'll be able to help you more due to lack of time, but I'm sure there are others out there! 

/Fredrik

At 15:59 2007-03-28, you wrote:
First of all i am not a network guy. I have a basic understand of all the equipment and understand how it works. I have a situation that I don't understand. 

AS400 820 is production system
As400 820 is identical and is the HA system

There are 2 10megabit/second lines attaching the 2 systems
Both lines are defined the same (100m Full duplex)

When I do a traceroute from Prod to HA, it takes about 2 seconds total
When I do a traceroute from HA to Prod, it takes 15-20 seconds total

I use the network address each time not the system name
Both traces come back with 3 hops
neither trace leaves the internal network loop

I would appreciate any help as to why the time differences

Thanks  in advance.
Dave Willenborg
FNTS
Omaha NE
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