Numerous DHCP entries in log

[Veeshun]

Hi, I've currently had my RT-N66u for about a month and a half now with no issues. I was looking at settings tonight when I checked my log and found this:

May 21 04:41:43 dnsmasq-dhcp[491]: DHCPINFORM(br0) 192.168.1.128 (Removed)
May 21 04:41:43 dnsmasq-dhcp[491]: DHCPACK(br0) 192.168.1.128 (Removed) M-PC
May 21 04:45:39 dnsmasq-dhcp[491]: DHCPREQUEST(br0) 192.168.1.128 (Removed)
May 21 04:45:39 dnsmasq-dhcp[491]: DHCPACK(br0) 192.168.1.128 (Removed) M-PC
May 21 04:45:44 dnsmasq-dhcp[491]: DHCPINFORM(br0) 192.168.1.128 (Removed)
May 21 04:45:44 dnsmasq-dhcp[491]: DHCPACK(br0) 192.168.1.128 (Removed) M-PC
May 21 04:47:05 dnsmasq-dhcp[491]: DHCPINFORM(br0) 192.168.1.128 (Removed)
May 21 04:47:05 dnsmasq-dhcp[491]: DHCPACK(br0) 192.168.1.128 (Removed) M-PC
May 21 04:48:21 dnsmasq-dhcp[491]: DHCPRELEASE(br0) 192.168.1.128 (Removed)
May 21 04:48:29 dnsmasq-dhcp[491]: DHCPDISCOVER(br0) 192.168.1.128 (Removed)
May 21 04:48:29 dnsmasq-dhcp[491]: DHCPOFFER(br0) 192.168.1.128 (Removed)
May 21 04:48:29 dnsmasq-dhcp[491]: DHCPREQUEST(br0) 192.168.1.128 (Removed)
May 21 04:48:29 dnsmasq-dhcp[491]: DHCPACK(br0) 192.168.1.128 (Removed) M-PC
May 21 04:48:32 dnsmasq-dhcp[491]: DHCPINFORM(br0) 192.168.1.128 (Removed)
May 21 04:48:32 dnsmasq-dhcp[491]: DHCPACK(br0) 192.168.1.128 (Removed) M-PC
May 21 04:49:55 dnsmasq-dhcp[491]: DHCPINFORM(br0) 192.168.1.128 (Removed)
May 21 04:49:55 dnsmasq-dhcp[491]: DHCPACK(br0) 192.168.1.128 (Removed) M-PC
May 21 04:55:26 dnsmasq-dhcp[491]: DHCPREQUEST(br0) 192.168.1.128 (Removed)
May 21 04:55:26 dnsmasq-dhcp[491]: DHCPACK(br0) 192.168.1.128 (Removed) M-PC
May 21 04:56:31 dnsmasq-dhcp[491]: DHCPINFORM(br0) 192.168.1.128 (Removed)
May 21 04:56:31 dnsmasq-dhcp[491]: DHCPACK(br0) 192.168.1.128 (Removed) M-PC
May 21 04:57:37 dnsmasq-dhcp[491]: DHCPINFORM(br0) 192.168.1.128 (Removed)
May 21 04:57:37 dnsmasq-dhcp[491]: DHCPACK(br0) 192.168.1.128 (Removed) M-PC
May 21 04:59:08 dnsmasq-dhcp[491]: DHCPINFORM(br0) 192.168.1.128 (Removed)
May 21 04:59:08 dnsmasq-dhcp[491]: DHCPACK(br0) 192.168.1.128 (Removed) M-PC

Is this normal? That often? That is my laptop which is running Windows 7 Professional 64bit with an Killer Wireless-N 1103 card. My router has Asus 3.0.0.4.354 firmware on it.

I've done some searching on these but found little to no info on them. Is there a way to read them to see what's causing this?

 

[Nerre]

If I don't recall wrong it's a matter of your PC telling the DHCP server that it is still alive, after half the lease time (looks like about 5 minutes between the entries which would mean the router is set to give a lease of 10 minutes for DHCP).

 

[geko53]

I've done some searching on these but found little to no info on them. Is there a way to read them to see what's causing this?

No idea either what is causing that behavior - but I had the same problem until I entered a fixed IP into the TCP/IPv4 settings of the one desktop PC that was affected...

Didn't get a sufficient answer up to now what is triggering those frequent queries that are put in spite of the fact that the lease time isn't over yet...

Ciao
Gerald

 

[Veeshun]

What do you guys recommend I do? I tried to read the packets in Wireshark with no luck. All my settings are default settings on the router so I don't know why the lease would be 10 minutes? Should I assign an IP to my laptop?

 

[Nerre]

A quick googling ("windows 7 dhcp spam" gave me http://www.neowin.net/forum/topic/874322-dhcpinform-and-dhcpack-spam/) indicates that it might be the Windows 7 computer using "proxy auto configuration". Try turning it of (not sure where it is done).

 

[bz2]

I got this message to. I am using 3.0.0.4.270.26 Merlin and it started for me a month ago also. It is on all of my devices not just one.

 

[Veeshun]

A quick googling ("windows 7 dhcp spam" gave me http://www.neowin.net/forum/topic/874322-dhcpinform-and-dhcpack-spam/) indicates that it might be the Windows 7 computer using "proxy auto configuration".
Try turning it of (not sure where it is done).

Where can I turn this off? Sorry about the late reply, I was out of town.

 

[geko53]

A quick googling ("windows 7 dhcp spam" gave me http://www.neowin.net/forum/topic/874322-dhcpinform-and-dhcpack-spam/) indicates that it might be the Windows 7 computer using "proxy auto configuration". Try turning it of (not sure where it is done).

Might be but isn't... In my settings proxy auto configuration is unchecked (Local Network - LAN - Automatic Configuration), and I don't use a proxy.

The only way I can get rid of this behavior is entering a static IP in the LAN IP settings of the PC...

Ciao
Gerald

 

[Veeshun]

Looks like I might of figured out the problem.

It looks like my GPS program was checking for updates every so often which was sending those out. So I uninstalled that. Then I noticed when my Avast checks for updates it also sends those out so what I did was I turned off the Software Updater. Then I went into Avast's settings, clicked Updates and scrolled down to the proxy settings which had "Auto Detect (Use IE Settings)" checked. I simply changed it to "Direct Connection (no proxy" and haven't been getting as many at all. In fact I went 12 hours without this PC sending one out.

I'd look into programs that like to check for updates and check proxy settings for those programs as well.

 

[bz2]

The flooding stopped when I turned of DHCP and configure the IP adress manual on Windows 7.