Asus RT-AC66U not serving DHCP

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kruuth
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PostPosted: Sat Dec 04, 2021 2:50    Post subject: Asus RT-AC66U not serving DHCP Reply with quote
I've got an Asus RT-AC66U, it's been running rather well, however, it won't serve DHCP addresses after a certain period of time. A reboot will fix this. At present, I'm using v3.0-r47656 giga. Would changing the version fix this?
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kernel-panic69
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PostPosted: Sat Dec 04, 2021 3:11    Post subject: Reply with quote
1) Please remove your double-tap (you posted the same post twice)

2) Need some further information of your environment. Don't know of any reason why DHCP would fail, unless you used an invalid hostname in a static lease or exceeded your pool size. I don't know of anything else

3) You can always opt to upgrade to the most recent release (47720 at present).

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kruuth
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PostPosted: Sat Dec 04, 2021 3:20    Post subject: Reply with quote
I have removed it. Sorry about that. No idea why it did it twice but the other is gone. Right now, I have three routers, the main one with the DHCP server, and the other two that I'm using as wireless access points. They're not running DHCP servers of their own and are reliant on the "main" one to provide DHCP. I'll update to the latest version now and see if that helps.
kernel-panic69
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PostPosted: Sat Dec 04, 2021 4:17    Post subject: Reply with quote
You may want to try enabling STP on the LAN (br0) of main router and on br0 both APs as well. If all are running DD-WRT, your WAPs should have the main router set as gateway in the main setup page. If the issue persists, perhaps screenshots of applicable settings may help us figure out what's wrong.
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GeeTek
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PostPosted: Sat Dec 04, 2021 11:12    Post subject: Reboot Reply with quote
Glitches like this are sometimes hardware related, especially if the radio is a couple of years old. If the firmware upgrade does not fix it then you might consider a scheduled reboot at 4 AM.
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kruuth
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PostPosted: Mon Dec 06, 2021 2:52    Post subject: Reply with quote
Ok well I'm still having DHCP issues after the update. How do I schedule a reboot or restart of DHCP?
kernel-panic69
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PostPosted: Mon Dec 06, 2021 3:10    Post subject: Reply with quote
http://your.router.ip.address/Alive.asp

Administration -> Keep Alive

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kruuth
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PostPosted: Mon Dec 06, 2021 17:54    Post subject: Reply with quote
Ok. Configured the router to auto-reboot. So far no other issues.
kruuth
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PostPosted: Tue Dec 07, 2021 2:57    Post subject: Reply with quote
Ok well was working, but it looks like I had to reboot the router this afternoon. Is there some way to replace netmasq with DHCPD or something?
kernel-panic69
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PostPosted: Tue Dec 07, 2021 3:24    Post subject: Reply with quote
Impossible because udhcpd is no longer included in DD-WRT. So, this is where we ask for screenshots of your configs to see what may be out of place. Only other option is hard resets and reconfigure from scratch, no restoring from backup.
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kruuth
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PostPosted: Tue Dec 07, 2021 3:49    Post subject: Reply with quote
Sorry I thought it was. Here's the config I have for DHCP if this helps


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kernel-panic69
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PostPosted: Tue Dec 07, 2021 3:59    Post subject: Reply with quote
If you are using WAN DNS or 3 static entries on the main setup page, turn off query in strict order. The only way that seems to not be having issues is via no-resolv directive. Are the devices just not getting IP addresses or are they losing internet?

The udhcpd was removed a while back:

https://svn.dd-wrt.com/changeset/39350
https://svn.dd-wrt.com/changeset/39351
https://svn.dd-wrt.com/changeset/39352
https://svn.dd-wrt.com/changeset/39353
https://svn.dd-wrt.com/changeset/39354
https://svn.dd-wrt.com/changeset/39355
https://svn.dd-wrt.com/changeset/39356

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kruuth
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PostPosted: Tue Dec 07, 2021 12:17    Post subject: Reply with quote
Turn off query in strict order? This is my main page. I am only using two DNS servers and I don't see an option for query.

As for the devices, they are not getting ip addresses. In this case, a laptop that is normally pulling an IP in range(100-149) will get the address 169.254.228.11 or something in the Automatic Private IP range.



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egc
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PostPosted: Tue Dec 07, 2021 12:23    Post subject: Reply with quote
Strict-order is on the Services Tab under DNSMasq options.

showing pictures of your settings is always very helpful as @kp69 always reiterates.

Looking at those I noticed you have set the static leases inside the DHCP range that could well be the cause of your problem.

Static leases should be set outside the DHCP range

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kruuth
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PostPosted: Tue Dec 07, 2021 13:51    Post subject: Reply with quote
OK. I was initially using those as static DHCPs, I can alter it so that they're not in the same range.
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