This may not be a tough question but I can't find an answer to it anywhere else. Basically, I'm curious to know what happens if I have two DHCP servers configured in a split-scope. If one DHCP server runs out of addresses, will it still respond to DHCPDISCOVER requests?

I'm worried about implementing a split-scope with, say, 100 addresses in each scope (200 total) and 150 clients. If more IPs are distributed from Server A than Server B, what happens when Server A is full? Will clients just get one from Server B (Server A no longer responds) or will Server A respond and give an address of 0.0.0.0?

-- Mark

I have a question regarding VRRP implementation. VRRP uses the physical IP address of the primary router, but it assigns a virtual MAC. However, the RFC was not clear if the router should respond using physical MAC or virtual MAC. From an implementation standpoint, I seem to see, most router vendors implementing using the router's physical MAC when responding to packets. Is this strange or does this pose issues?

I've seen cases where downstream, certain equipment that does SRC MAC look-up have an issue when the router advertises virtual MAC and responds using physical MAC. A device that does SRC MAC look-up will fail because it's different from the MAC table. So CPU spikes. What's your view?

-- Max

I completed my Cisco Certified Network Associate (CCNA) last year and I'm a bit skeptical on which track to pursue at the professional level. I've always wanted to be involved with the ISP environment and I know that the Cisco Certified Internetwork Professional (CCIP) track is the one which is aligned to my goals, but my question is: How respectable or accepted is the CCIP in certification circles as compared to CCNP?

I know that the CCNP has more numbers -- as in, the people gunning for it -- so I need something which is a bit unique and is also in-demand. Is CCIP the way to go?

-- Fortune

Does ICMP redirect cause performance issues?

The scenario is quite simple: All devices have their default gateway 192.168.0.1 to access the Internet, but there are five other networks (192.168.1.0/24, 192.168.2.0/24, 192.168.3.0/24, 192.168.4.0/24 and 192.168.5.0/24) that are redirected through ICMP redirect by 192.168.0.1 to the 192.168.0.254 that is the router that connects to these networks. There are no Layer3 switches in between.

-- Marcelo

I have question as to why something actually is working. We have a private network with an ISA 2006 server to the public. We have set up an independent test domain on a virtual server, also with a private network:

Now, what's working -- but seems it shouldn't -- is that when we connect to a machine in Gyrusdom.net from GyrusTest.net using \\\c$, it will ask for authentication...but I am really not sure how it is working at all.

-- Monec