I have a same problem like my colleague below.
I tried some dsl router and I can't login to my company's network. If I
connect without the dsl router, everything is ok.

Now, I'm testin NetGear RP614 with 5.x firmware (it should be good -said
ncssysop.hypermarket.net), I have BM3.7 in my company.

I use network with my dsl router (home network).
I haven't got this network in my company.

What can be the problem? MTU size? What should I do?