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DHCP Discover Questions

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Hello,

I have an issue where I upgraded device and now clients cannot get an IP address from my domain controller. I've got two of these devices and the other one has not been upgraded so decided to look into both discover packets. There is connectivity between everything and the DC sees the discover packet yet doesn't offer up anything. There's no errors within the server and restarting the services and server didn't help.

  1. Under the DHCP section and Relay agent IP it looks like this. "Relay agent IP address: 10.1.1.0 (10.1.1.0)" this is on the bad pcap vs the good pcap doesn't have the extra IP inside the parenthesis ().

  2. Same scenario for source address under the IPv4 section bad pcap shows "source address: 10.1.1.1 (10.1.1.1) and the good pcap doesn't have the extra IP inside the parenthesis again ()

is the extra IP inside the parenthesis my issue?

Thanks for any help in advance.

cpocket's avatar
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cpocket
asked 2023-01-11 20:28:30 +0000
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These "extra IP inside the parenthesis" are a result of the way that particular instance of Wireshark is configured. If name resolution is enabled, this is where the name resolution result is presented. In this case, these being private range addresses, having no DNS name related to them, the only way to refer to the name of the host is by it's IPv4 address representation. That is what is shown "inside the parenthesis". So this has noting to do with the working/not working DHCP.

Jaap's avatar
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Jaap
answered 2023-01-12 06:31:38 +0000
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That was my issue thanks! I was viewing them on separate PCs and the one did have that feature enabled.

cpocket's avatar cpocket (2023-01-12 13:29:27 +0000) edit
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