RE450 strange DHCP behavior

RE450 strange DHCP behavior
RE450 strange DHCP behavior
2016-08-13 18:11:07
Model :

Hardware Version : Not Clear

Firmware Version :

ISP :

Hello,
I have RE450 (EU version) with latest firmware (160727), and DHCP client in extender behaves strangely. After start everything is OK, classic sequence DHCP Discovery, DHCP Offer, DHCP Request, DHCP Ack, so RE450 is seeking for DHCP server, server answers with offer of free IP address, RE450 sends request for this IP and finally server assigns IP to extender.

But then, after a while, when is time to confirm existing IP address (75% of lease time), RE450 should send DHCP Request with existing IP (RE450 should shout "hey, I am still here and want to keep my IP") and server should confirm that. Instead of this standard behavior, RE450 sends DHCP Discovery again (this is incorrect, extender is no more new freshly connected device without IP) and my server answers with offer of new free IP address, then RE450 sends request for this new IP and server confirms that. So the IP address of extender is still changing (192.168.1.150, after a while 192.168.1.151, then 192.168.1.152 and so on).

I also have TL-WA850RE and it behaves correctly - when is time to confirm existing IP, it sends DHCP Request with existing IP

Some logs.

RE450 - incorrect DHCP behavior is red:

0 days 00:00:08 OTHERS INFO Booted the system.
0 days 00:00:43 WIRELESS ERROR 2.4/5GHz failed the connection to the front end, due to: Connecting timed out.
0 days 00:00:43 WIRELESS ERROR 2.4/5GHz failed the connection to the front end, due to: Connecting timed out.
0 days 00:00:43 WIRELESS INFO 2.4/5GHz successfully association to the front end.
0 days 00:00:43 WIRELESS INFO Key exchange between 2.4/5GHz and the front end started.
0 days 00:00:43 WIRELESS INFO Key exchange between 2.4/5GHz and the front end succeeded.
0 days 00:00:43 WIRELESS INFO 2.4/5GHz successfully connected to the front end(MAC: 00:36:76:0e:70:ec).
0 days 00:00:45 DHCPC INFO Sent a detection for DHCP.
0 days 00:00:45 DHCPC INFO Received a DHCP offer:Server ID is 54.Assigned IP address is 192.168.1.145
0 days 00:00:45 DHCPC INFO Sent a request for DHCP.
0 days 00:00:47 DNS ERROR DNS probing failed, DUT can not get a dns server.
0 days 00:00:47 NTP INFO NTP detection succeeded.
0 days 00:00:48 DHCPC INFO DHCP obtained an IP address 192.168.1.145
0 days 00:00:59 DNS INFO DNS detection succeeded.
0 days 00:00:59 NTP INFO NTP detection succeeded.
0 days 00:04:36 DHCPC INFO Sent a detection for DHCP.
0 days 00:04:36 DHCPC INFO Received a DHCP offer:Server ID is 54.Assigned IP address is 192.168.1.146
0 days 00:04:36 DHCPC INFO Sent a request for DHCP.
0 days 00:04:39 DHCPC INFO DHCP obtained an IP address 192.168.1.146
0 days 00:08:27 DHCPC INFO Sent a detection for DHCP.
0 days 00:08:27 DHCPC INFO Received a DHCP offer:Server ID is 54.Assigned IP address is 192.168.1.147
0 days 00:08:27 DHCPC INFO Sent a request for DHCP.
0 days 00:08:30 DHCPC INFO DHCP obtained an IP address 192.168.1.147
0 days 00:12:18 DHCPC INFO Sent a detection for DHCP.
0 days 00:12:18 DHCPC INFO Received a DHCP offer:Server ID is 54.Assigned IP address is 192.168.1.148
0 days 00:12:18 DHCPC INFO Sent a request for DHCP.
0 days 00:12:21 DHCPC INFO DHCP obtained an IP address 192.168.1.148

Now log from my TL-WA850RE - correct DHCP behavior is green:


Aug 12 10:46:38 OTHER INFO System started
Aug 12 10:46:52 WIRELESS ERROR Association failed, reason: scanning failed
Aug 12 10:46:54 WIRELESS ERROR Association failed, reason: scanning failed
Aug 12 10:47:03 WIRELESS INFO Association to root AP successfully
Aug 12 10:47:03 WIRELESS INFO Key negotiation started
Aug 12 10:47:04 WIRELESS INFO Key negotiation successfully
Aug 12 10:47:04 WIRELESS INFO Connected to root AP, MAC address: 00:36:76:0e:70:eb
Aug 12 10:47:05 DHCPC INFO DHCPC Send DISCOVER with request ip 0.0.0.0 and unicast flag 0
Aug 12 10:47:05 DHCPC INFO DHCPC Recv OFFER from server 192.168.1.1 with ip 192.168.1.131
Aug 12 10:47:05 DHCPC INFO DHCPC Send REQUEST to server 192.168.1.1 with request ip 192.168.1.131
Aug 12 10:47:06 DNS ERROR DNS probing failed, DUT can not get a dns server
Aug 12 10:47:06 NTP ERROR NTP connection fail, no connection to the internet
Aug 12 10:47:08 DHCPC INFO DHCPC Recv ACK from server 192.168.1.1 with ip 192.168.1.131 lease time 300
Aug 12 10:47:09 OTHER INFO DHCPC probing successfully, DHCP server closed
Aug 12 10:47:12 OTHER INFO DHCPC probing successfully, DHCP server closed
Aug 12 10:47:20 DNS INFO DNS service probed successfully, connected to the internet
Aug 12 10:47:20 NTP INFO NTP connection success, connected to the internet
Aug 12 10:49:36 DHCPC INFO DHCPC Send REQUEST to server 192.168.1.1 with request ip 192.168.1.131
Aug 12 10:49:39 DHCPC INFO DHCPC Recv ACK from server 192.168.1.1 with ip 192.168.1.131 lease time 300
Aug 12 10:52:07 DHCPC INFO DHCPC Send REQUEST to server 192.168.1.1 with request ip 192.168.1.131
Aug 12 10:52:09 DHCPC INFO DHCPC Recv ACK from server 192.168.1.1 with ip 192.168.1.131 lease time 300
Aug 12 10:54:38 DHCPC INFO DHCPC Send REQUEST to server 192.168.1.1 with request ip 192.168.1.131
Aug 12 10:54:40 DHCPC INFO DHCPC Recv ACK from server 192.168.1.1 with ip 192.168.1.131 lease time 300
Aug 12 10:57:09 DHCPC INFO DHCPC Send REQUEST to server 192.168.1.1 with request ip 192.168.1.131
Aug 12 10:57:11 DHCPC INFO DHCPC Recv ACK from server 192.168.1.1 with ip 192.168.1.131 lease time 300
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