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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...
This does appear to be two issues:
- ISP not responding to DHCP Request unless the SECS field is four or greater.
- RAX30 not increasing the SECS number if DHCP Requests do not get a response.
Does this phenomenon appear to happen:
- Only when the RAX30 is powered up?
- Every time the ISP DHCP lease expires and the RAX30 attempts to renew the lease?
Yes, I agree it's two issues. I've been trying to contact the ISP to let them know of the problem on their side, but they are currently putting the blame on NETGEAR, and they do not have enough customers with this problem yet.
The phenomenon with the RAX30 seems to occur as the router attempts to detect the WAN connection. This occurs at startup and when forcing it to try and find the internet connection on setup. It will keep sending three DHCP DISCOVER requests in a row, spaced roughly 2 seconds apart. All these packets will have the SECS field set to 0. After 9 seconds, it will change the transaction id (xid) and then try three more times. All the packets will have the SECS field at 0. It will repeat this until it reports that it can't find an internet connection.
I have packet captures for any of these behaviors.