Nortel Baystack 450-24T question

[DigitelD]

We are a telecom company and we have a Cisco ASA and a Nortel BES switch that we use for our data. We also have a Baystack 450 that we use to put equipment on our network for testing and configuration. In the mornings when I come in and login to my laptop I sometimes am unable to access the internet. When I type in ipconfig from the command prompt I see that I have been issued an IP address of 192.168.1.XX. I should be getting a Class A IP address. I have checked our other hardware to make sure that we are not getting the wrong IP from them. I thing we could be getting it from the Baystack. I don't know how to connect to it to check it. Can anyone help?
Thanks,

SHK Certified (School of Hard Knocks)
NCSS

 

[jimbopalmer]

The Baystack 450 has no DHCP server. (as of v4.2) I do not recall it even having a DHCP helper address. (to point to a remote DHCP server) DHCP works by the fastest reply to a broadcast, so if there is another DHCP server plugged into the 450, it may be replying faster than the DHCP server you hope to get.

I tried to remain child-like, all I acheived was childish.

 

[DigitelD]

I'll have to keep looking then. Thanks for your reply. I checked the ASA and the BES and no luck on finding the culprit. I even checked our BCM.

SHK Certified (School of Hard Knocks)
NCSS

 

[CharlesBr]

I don't know if the 450 can do it but in some baystack I've seen a way to trust only the port(s) you want for DHCP

 

[DaddyOfThree]

It sounds like you have a rogue DHCP server on your network. Why not just load up WireShark and sniff the DHCP/BOOTP packets and see what the IP/MAC address of the culprit server is. You can then use the FDB/MAC and ARP tables to locate the port of the offending device and disconnect it from the network.

Good Luck!