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Forum Discussion
Nighthawk RAX30 - DHCP Client Issues
I've noticed something strange whenever my RAX30 sends DHCP DISCOVER messages to my ISP DHCP server to obtain an IP address. The DHCP specification RFC2131 talks about a field in the DHCP DISCOVER pa...
Since you have the capability to capture and display the DHCP conversation between router and ISP, it might be interesting to document "what is going on?" with whatever router is working correctly now. (assuming that there IS a working system.) or, even with a random device connected to the ISP (computer, laptop, AppleTV, etc.)
i.e. Does the ISP always ignore the first DHCP request that (by definition) has a SECS value of zero. and then respond to a subsequent request that has an actual value for SECS?
Or, does the ISP respond to the first DHCP request made by devices other than the RAX30?
In my captures and experiments so far, I've yet to see the DHCP server respond to a request that has a 0 SECS value. The working router sends two DISCOVER packets with six seconds between them, and the SECS field is set to 6 accordingly. The DHCP server responds to the second packet with the SECS value of 6.
It's a really strange behavior on the ISP side, and I was trying to look into what configuration might cause this issue, but I haven't turned up anything yet.