[Linksys/Cisco BEFSX41] Connected DSL, ping works, all DNS queries fail

Hello.

All is in the title.

The brand new router is connected to my ISP through his DSL box, which is
configured in simple bridge mode.

The connection is on: from the PC in IPCONFIG /ALL, I can see the IP of the
DNS servers, and I can successfully ping them.

But simply pinging any domain name fails: no resolution. And so no Web etc.

I tried on LAN side both in DHCP and fix IP mode, no change.
I tried to completely disable the firewall, no change.

Actually, the router simply does not properly propagate the DNS queries :-(

Notice that the same connection works when replacing only the router with my
old one (Netgear).

Maybe a tip... I adjusted the MTU to 1492 because it is recommended for the
DSL box. I've read in some advices that there could be a related problem
with some Linksys routers (due to a bug in the firmware ?).

Any idea of what is happening ? Thank you.

 

Hello Me.

So if someone finds the question, here is the answer:

I got it to work by setting the MTU to disable (custom value), so enabling
automatic management.

Finally if it manages to manage, why not ?

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strange solution.

 

Me again.

OK, DNS works but many timeouts after, really unusable :[email protected]

I downgraded the builtin firmware v.1.50.18 to old 1.45.3 and now, all works
fine, even when setting back the MTU to manual value of 1492.

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