I read your Q&A "The Monkey Mind of Administrative Distance." The example shows OSPF and the way to change the AD using an access list. Question is, how can you do it with IS-IS?

I've found the same command under "router isis," but it has different parameters and I can't "choose" which routes get the new AD (only the ones sourced from IP or CLNS, and not via a route-map or access list or anything like that). Can you help clarify this?

-- Shai

I'm new to managing WAN circuits and am a little confused. I read your Q&A "Total Bandwidth of a T-1 Redux" but it didn't address the issue clearly to me. My theory on the T1 connection is that since the transmit pair of wires is separate from the receive pair of wires, you should be able to get 1.5MB up and down at the exact same time for a total aggregate throughput of 3MB. In my network monitoring, this hasn't been the case, so I'm just looking for verification. Also, does this apply to 100MB full-duplex connections?

-- Alexander

I ran across a question in some training materials that made no sense to me. It had to do with OSPF and area numbers. One side of the link was area 257 and the other side had to connect but was not allowed to use the phrase "area 257." The anwer provided was "area 0.0.1.1" but this made no sense to me. Can you help?

-- James

I have configured a DHCP (ISC) server for one of my VLANs. DHCPDISCOVER packets from a client get to the server via a helper address on a Cisco router, and the server issues a DHCPOFFER to the client from its assigned scope. I can see the above using tcpdump. However, for some reason, the offered address gets dropped somewhere on its way back to the client.

My setup is as follows: Two DHCP servers on VLAN 1 (default). Just a couple of clients on a test VLAN which requests IP addresses via the helper address.

Any suggestions/pointers?

-- Sandip

I want to do a simple ADSL backup link using back-to-back connection (with two routers -- router-to-router). How is the physical setup connectivity? Can we do ADSL connection with back-to-back?

-- Azizi