struggling with AX55 DHCP (LAN side not WAN uplink)

struggling with AX55 DHCP (LAN side not WAN uplink)

struggling with AX55 DHCP (LAN side not WAN uplink)
struggling with AX55 DHCP (LAN side not WAN uplink)
2024-06-20 23:17:10
Model: Archer AX55  
Hardware Version: V1
Firmware Version: 1.2.6 Build 20231130 rel.36135(4555)

Been struggling the last few days with devices on my network, after the AX55 has been running solidly for 2 yrs with no issues.

I have auto-update on the firmware and am running the latest, but not sure exactly when it last updated.


I have an 'average' houseload of devices - 2 chromecasts, 4 wifi lights and 2 wifi powerpoints, ipads, kids phones, and a few wired and wireless PCs and laptops. Oh, and the kids' friends' laptops and phones because they all need free wifi of course :-) I have both 5 and 2.4 ghz wifi configured.

 

Suddenly the other day, the majority of devices (wired and wireless) were not able to get IP addresses.

 

I looked at my DHCP leases and noticed that many of them were very high in the range so I thought maybe I was running out of addresses. Odd.

So I expanded the DHCP subnet mask from 255.255.255.0 to 255.255.252.0 figuring that would give me more IP addresses. It certainly did. 

After numerous reboots to clean out leases this mostly cleared things up, but now I'm at a point where most devices can connect (maybe 85%), but not everything.

In particular, iPhones are fine, iPads struggle but eventually connect, and samsung galaxy phones (2 of them) won't connect at all. Windows laptops are hit and miss. 

 

Interestingly, if I manually override a spare IP address, subnet mask (255.255.252.0), gateway (192.168.0.1) and DNS (192.168.0.1) into the client device (eg my windows laptop), it connects and seems to work fine.

 

What am I missing?

 

Thanks!! 

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2 Reply
Re:struggling with AX55 DHCP (LAN side not WAN uplink)
2024-06-20 23:52:03 - last edited 2024-06-21 01:56:32

not sure if it's relevant, but I get these entries in the system log EXACTLY every 15 minutes:

 

2024-06-21 09:44:50 DHCPC INFO [14241] receive ack from server with ip xxx.xxx.xxx.xxx, options(subnet=255.255.252.0;router=xxx.xxx.xxx.xxx;dns=xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx;lease=1800;serverid=xxx.xxx.xxx.xxx;)

2024-06-21 09:44:50 DHCPC INFO [14241] send select request with options(cliid=01/e2:98:29:9d:b7:16:;)

2024-06-21 09:44:50 DHCPC INFO [14241] 1/2 lease passed, enter renewing state

 

2024-06-21 09:29:45 DHCPC INFO [14241] receive ack from server with ip 119.17.133.208, options(subnet=255.255.252.0;router=xxx.xxx.xxx.xxx;dns=xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx;lease=1800;serverid=xxx.xxx.xxx.xxx;)

2024-06-21 09:29:45 DHCPC INFO [14241] send select request with options(cliid=01/e2:98:29:9d:b7:16:;)

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Re:struggling with AX55 DHCP (LAN side not WAN uplink)
2024-06-21 16:59:45 - last edited 2024-06-21 17:04:56

  @Dave_G_99 

 

You say that you expanded the DHCP scope by changing the DHCP subnet mask.  Did you also change the subnet mask in the LAN settings?

 

Until you get everything working smoothly again, I would decrease the lease time of the DHCP server to a low figure, such as 30 minutes.  Also, you should be able to determine the number of addresses that you need by just using the number of (normally) connected clients.  I doubt that you really need more than 200+ addresses and I would revert back to the 255.255.255.0 subnet mask.

 

 

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