Hi folks,
While looking at my network I've spotted that my laptop is constantly sending DHCPREQUEST. Everything appears to be working fine, both on my laptop and elsewhere apart from this. One other client, a Win7 PC appears to have the same problem, but everything else on the network seems fine and refreshes only infrequently.
Any ideas?
/var/log/messages on my laptop:
Mar 18 16:47:56 gary dhclient[1483]: DHCPREQUEST on wlp0s20u3 to 10.1.1.253 port 67 (xid=0x7d0ac797) Mar 18 16:47:56 gary NetworkManager[907]: DHCPREQUEST on wlp0s20u3 to 10.1.1.253 port 67 (xid=0x7d0ac797) Mar 18 16:47:56 gary dhclient[1483]: DHCPREQUEST on wlp0s20u3 to 10.1.1.253 port 67 (xid=0x7d0ac797) Mar 18 16:47:56 gary NetworkManager: DHCPREQUEST on wlp0s20u3 to 10.1.1.253 port 67 (xid=0x7d0ac797) Mar 18 16:48:12 gary dhclient[1483]: DHCPREQUEST on wlp0s20u3 to 10.1.1.253 port 67 (xid=0x7d0ac797) Mar 18 16:48:12 gary NetworkManager[907]: DHCPREQUEST on wlp0s20u3 to 10.1.1.253 port 67 (xid=0x7d0ac797) Mar 18 16:48:12 gary dhclient[1483]: DHCPREQUEST on wlp0s20u3 to 10.1.1.253 port 67 (xid=0x7d0ac797) Mar 18 16:48:12 gary NetworkManager: DHCPREQUEST on wlp0s20u3 to 10.1.1.253 port 67 (xid=0x7d0ac797)
my DHCP server:
Mar 18 16:51:03 sid dhcpd: DHCPACK on 10.1.103.236 to 00:0f:60:02:d0:c9 (gary) via p4p1 Mar 18 16:51:06 sid dhcpd: DHCPREQUEST for 10.1.4.238 from 8c:89:a5:51:42:16 (KSALES5) via p4p1:2 Mar 18 16:51:06 sid dhcpd: DHCPACK on 10.1.4.238 to 8c:89:a5:51:42:16 (KSALES5) via p4p1:2 Mar 18 16:51:06 sid dhcpd: DHCPREQUEST for 10.1.4.238 from 8c:89:a5:51:42:16 (KSALES5) via p4p1 Mar 18 16:51:06 sid dhcpd: DHCPACK on 10.1.4.238 to 8c:89:a5:51:42:16 (KSALES5) via p4p1 Mar 18 16:51:14 sid dhcpd: DHCPREQUEST for 10.1.4.238 from 8c:89:a5:51:42:16 (KSALES5) via p4p1:2 Mar 18 16:51:14 sid dhcpd: DHCPACK on 10.1.4.238 to 8c:89:a5:51:42:16 (KSALES5) via p4p1:2 Mar 18 16:51:14 sid dhcpd: DHCPREQUEST for 10.1.4.238 from 8c:89:a5:51:42:16 (KSALES5) via p4p1 Mar 18 16:51:14 sid dhcpd: DHCPACK on 10.1.4.238 to 8c:89:a5:51:42:16 (KSALES5) via p4p1 Mar 18 16:51:18 sid dhcpd: DHCPREQUEST for 10.1.103.236 from 00:0f:60:02:d0:c9 (gary) via p4p1:2 Mar 18 16:51:18 sid dhcpd: DHCPACK on 10.1.103.236 to 00:0f:60:02:d0:c9 (gary) via p4p1:2 Mar 18 16:51:18 sid dhcpd: DHCPREQUEST for 10.1.103.236 from 00:0f:60:02:d0:c9 (gary) via p4p1 Mar 18 16:51:18 sid dhcpd: DHCPACK on 10.1.103.236 to 00:0f:60:02:d0:c9 (gary) via p4p1
On Wed, Mar 18, 2015 at 10:51 AM, Gary Stainburn < gary.stainburn@ringways.co.uk> wrote:
While looking at my network I've spotted that my laptop is constantly sending DHCPREQUEST.
This looks like some kind of firewall issue. The laptop sends a request, the server sees it and sends the ack, but the laptop never sees the ack.
--Greg
On Wednesday 18 March 2015 19:02:57 Greg Woods wrote:
On Wed, Mar 18, 2015 at 10:51 AM, Gary Stainburn <
gary.stainburn@ringways.co.uk> wrote:
While looking at my network I've spotted that my laptop is constantly sending DHCPREQUEST.
This looks like some kind of firewall issue. The laptop sends a request, the server sees it and sends the ack, but the laptop never sees the ack.
--Greg
I did wonder this, but I've checked both my Linux laptop and the Win7 client and neither have an active firewall.
On 19Mar2015 09:17, Gary Stainburn gary.stainburn@ringways.co.uk wrote:
On Wednesday 18 March 2015 19:02:57 Greg Woods wrote:
On Wed, Mar 18, 2015 at 10:51 AM, Gary Stainburn < gary.stainburn@ringways.co.uk> wrote:
While looking at my network I've spotted that my laptop is constantly sending DHCPREQUEST.
This looks like some kind of firewall issue. The laptop sends a request, the server sees it and sends the ack, but the laptop never sees the ack. --Greg
I did wonder this, but I've checked both my Linux laptop and the Win7 client and neither have an active firewall.
Greg's diagnosis may not be strictly true, depending on what the DHCP client logs.
In particular, I do not see an DHCPOFFER packets from the server in those logs; maybe the server does not issue dynamic leases (generates an address for anyone) and only issues fixed leases (for explicit known hosts in the config file).
1: Examine the server dhcpd.conf to see if it has a dynamic range of addresses for DHCP, or just a fixed explicit set of host configs.
2: Run tcpdump on laptop and server, see what actualy packets are going in/out, rather than relying on the log files to recite everything.
Cheers, Cameron Simpson cs@zip.com.au
What's fair got to do with it? It's going to happen. - Lawrence of Arabia
Maybe it's looking for the autoconfig file wpad.dat and not finding it.
dhcpd.conf option local-pac-server code 252 = text; option local-pac-server "http://wpad.example.com:80/wpad.dat";
Bill
On 3/18/2015 12:51 PM, Gary Stainburn wrote:
Hi folks,
While looking at my network I've spotted that my laptop is constantly sending DHCPREQUEST. Everything appears to be working fine, both on my laptop and elsewhere apart from this. One other client, a Win7 PC appears to have the same problem, but everything else on the network seems fine and refreshes only infrequently.
Any ideas?
/var/log/messages on my laptop:
Mar 18 16:47:56 gary dhclient[1483]: DHCPREQUEST on wlp0s20u3 to 10.1.1.253 port 67 (xid=0x7d0ac797) Mar 18 16:47:56 gary NetworkManager[907]: DHCPREQUEST on wlp0s20u3 to 10.1.1.253 port 67 (xid=0x7d0ac797) Mar 18 16:47:56 gary dhclient[1483]: DHCPREQUEST on wlp0s20u3 to 10.1.1.253 port 67 (xid=0x7d0ac797) Mar 18 16:47:56 gary NetworkManager: DHCPREQUEST on wlp0s20u3 to 10.1.1.253 port 67 (xid=0x7d0ac797) Mar 18 16:48:12 gary dhclient[1483]: DHCPREQUEST on wlp0s20u3 to 10.1.1.253 port 67 (xid=0x7d0ac797) Mar 18 16:48:12 gary NetworkManager[907]: DHCPREQUEST on wlp0s20u3 to 10.1.1.253 port 67 (xid=0x7d0ac797) Mar 18 16:48:12 gary dhclient[1483]: DHCPREQUEST on wlp0s20u3 to 10.1.1.253 port 67 (xid=0x7d0ac797) Mar 18 16:48:12 gary NetworkManager: DHCPREQUEST on wlp0s20u3 to 10.1.1.253 port 67 (xid=0x7d0ac797)
my DHCP server:
Mar 18 16:51:03 sid dhcpd: DHCPACK on 10.1.103.236 to 00:0f:60:02:d0:c9 (gary) via p4p1 Mar 18 16:51:06 sid dhcpd: DHCPREQUEST for 10.1.4.238 from 8c:89:a5:51:42:16 (KSALES5) via p4p1:2 Mar 18 16:51:06 sid dhcpd: DHCPACK on 10.1.4.238 to 8c:89:a5:51:42:16 (KSALES5) via p4p1:2 Mar 18 16:51:06 sid dhcpd: DHCPREQUEST for 10.1.4.238 from 8c:89:a5:51:42:16 (KSALES5) via p4p1 Mar 18 16:51:06 sid dhcpd: DHCPACK on 10.1.4.238 to 8c:89:a5:51:42:16 (KSALES5) via p4p1 Mar 18 16:51:14 sid dhcpd: DHCPREQUEST for 10.1.4.238 from 8c:89:a5:51:42:16 (KSALES5) via p4p1:2 Mar 18 16:51:14 sid dhcpd: DHCPACK on 10.1.4.238 to 8c:89:a5:51:42:16 (KSALES5) via p4p1:2 Mar 18 16:51:14 sid dhcpd: DHCPREQUEST for 10.1.4.238 from 8c:89:a5:51:42:16 (KSALES5) via p4p1 Mar 18 16:51:14 sid dhcpd: DHCPACK on 10.1.4.238 to 8c:89:a5:51:42:16 (KSALES5) via p4p1 Mar 18 16:51:18 sid dhcpd: DHCPREQUEST for 10.1.103.236 from 00:0f:60:02:d0:c9 (gary) via p4p1:2 Mar 18 16:51:18 sid dhcpd: DHCPACK on 10.1.103.236 to 00:0f:60:02:d0:c9 (gary) via p4p1:2 Mar 18 16:51:18 sid dhcpd: DHCPREQUEST for 10.1.103.236 from 00:0f:60:02:d0:c9 (gary) via p4p1 Mar 18 16:51:18 sid dhcpd: DHCPACK on 10.1.103.236 to 00:0f:60:02:d0:c9 (gary) via p4p1
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Bill Shirley -
Cameron Simpson -
Gary Stainburn -
Greg Woods