disappearing router on a lan

I've had this problem now for a few days, posted a question earlier
but now I think I'm narrowing down the problem.

I have a lan with a USR router at one end. It connects up to the ADSL
provider without problems, handles DHCP for the lan perfectly, etc.
However, after a certain unpredictable time period (could be 10mins
could be 18hours) the router is no longer reachable. Only way to get
it back is to power off the router and turn it back on.

The router has its own error logging, but the problem is two-fold:
a) being no longer visible to the lan I can't get into the router to
read the logs
b) they get reset every time the power gets switched off/on.
So the internal logs are of no use.

Any thoughts on what could be causing this lan disappearing? MTU
settings? Or any thoughts on how I can narrow this down?

Thanks!

Marko

On 19 Oct 2003 05:13:50 -0700, marko <(E-Mail Removed)> wrote:
> I've had this problem now for a few days, posted a question earlier
> but now I think I'm narrowing down the problem.
>
> I have a lan with a USR router at one end. It connects up to the ADSL
> provider without problems, handles DHCP for the lan perfectly, etc.
> However, after a certain unpredictable time period (could be 10mins
> could be 18hours) the router is no longer reachable. Only way to get
> it back is to power off the router and turn it back on.
>
> The router has its own error logging, but the problem is two-fold:
> a) being no longer visible to the lan I can't get into the router to
> read the logs
> b) they get reset every time the power gets switched off/on.
> So the internal logs are of no use.
>
> Any thoughts on what could be causing this lan disappearing? MTU
> settings? Or any thoughts on how I can narrow this down?

I had an SMC router that refused to link to PC cards (16-bit or cardbus)
unless they were forced back to 10baseT. I also have a 3Com card that now
seems to choke at 100baseT (20-100% packet loss), but works fine as
10baseT connection (pppoe) to my adsl modem. So check ifconfig and your
logs for any sign of problems, or as experiment try:

mii-tool -A 10baseT-FD,10baseT-HD eth0

Can your router log externally (to your syslog)? I have not had one that
could, but my Linksys WAP11 v2.2 can log to my Linux syslog, but all that
tells me is when it boots or a wireless connection associates.

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