Emiku- no, no single nic or any other non-standard features/equipment. The Devs have way too much going on with the standard setups to try and diagnose problems caused by problems that I've introduced...
Coley/Emiku- interesting idea- I will try and set the external ip to static. As it is, with DHCP from my cable modem on the external network (yes, external is eth0; yes, internal is eth1) the core is able to browse the internet without an issue. The crazy part was that I had a wireless router downstream of the core serving out 192.168.80.xx addresses and computers connected to this router could not get past the core- I could get the admin pages, but could not hit anything above that. Upon clicking the update button, computers on this router were able to hit the internet.
What I do not understand is the cannot connect to router issue. The MDs are able to connect to the core- they have to otherwise during the PXE boot it would time out. But they do connect and the screen fills up with the startup information. Then, IIRC, after it determines the network speed, the screen goes blank with out that "ERROR: cannot connect....". I think I am going to try 2 things tonight:
1) try a different MD- this one has worked great in 710 and 810, but who knows, maybe something unpredictable happened.
2) move MD(s) directly downstream of the core- right now they go through a switch, but I think I will try connecting one directly to the core and seeing if that makes a difference. Maybe my switch went bad.
Something probably completely unrelated, is that I was with 810 having problems with 1 MD connecting at 1000mbs. Half the time the MD would fail to PXE boot- would say a host could not be found or whatever the message is about the cable not being connected, a quarter of the time the boot would die part of the way through and the other quarter of the time the MD seemed to do just fine. I have cat5e/6 through the house and all I did was force 100mbs by using a cat5 cable from the wall outlet to my MD NIC and never had an issue afterwards. Probably just a fluke.
UPDATE: No luck- changed the external address to static from DHCP and no luck- MDs still don't connect.