Simon Wiehe writes:
> My problem is that the network connections to the Ultra 5 are very
> slow. A telnet session (using Putty on Windows) works fine for a few
> minutes and then pauses for several seconds and then works fine
> again. I have tried using Cygwin/X to start a Gnome session and that
> partially starts but I never get a login prompt, just an hour glass
> (sun variety) and a black screen. I also switched the X session to
> try and start an X application with the display set to the Window
> machine running Cygwin/X and it just seems to hang with nothing
> appearing on the windows machine.
A good place to start would be to examine the packets on the network
to see if there are any clues about what's going wrong. You can do
this with snoop (which comes with Solaris) or ethereal (available from
multiple places, including blastwave). Ethereal's easier.
Based on the symptoms, likely causes include:
- Large numbers of packet drops on the path to that host
- Path MTU problems
- Some sort of packet storm on your local network (can sometimes
result from misconfigured interfaces; check the subnet masks)
- ARP or routing conflict or misconfiguration
- Hardware trouble, such as using ndd to "force" the local Ethernet
link duplex to full and causing the switch to fall back to half
duplex
Are there particular packets that preceded or follow the outage? If
you ping the failing host, does it respond? Are there many drops?
Try pinging with different packet sizes (including sizes around 1472).
If large packets have trouble, then it's likely an MTU problem.
Are there any messages in /var/adm/messages? You can bump up the
detail level using /etc/syslog.conf (and then pkill -HUP syslogd).
What does "netstat -ni" say? What do the kstats for the Ethernet
interface say? Are there errors? What does your local bridge /
switch / router say about the interface?
> I am looking for pointers to documentation that will help me
> diagnose any issues and also any tools that can give me an idea of
> what is going on. I have limited Linux admin knowledge, I tend to
> fumble my way through HOWTOs and FAQs to get things working.
There are a fair number of FAQs on the web that address these sorts of
issues on Solaris as well. Google is one way to find them.
--
James Carlson, KISS Network <[EMAIL PROTECTED]>
Sun Microsystems / 1 Network Drive 71.232W Vox +1 781 442 2084
MS UBUR02-212 / Burlington MA 01803-2757 42.496N Fax +1 781 442 1677
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