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Old 06-16-2009, 08:55 AM
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Posts: 108
Default [7.402] Third DHCP not working. Can't aquire any ipadress.
Hi,

I have an ASG with a Intel quad card:

eth0: internal lan (DHCP, 192.168.2.x)
eth1: external
eth2: guest lan (DHCP with VLAN ID 20, 192.168.4.x) <--- not working
eth3: wireless lan (DHCP with VLAN ID 10, 10.0.10.x)

I'm trying to get eth2 to work, but i can't get the dhcp to give out any adress. The switch is setup with VLAN for 2 ports with VLAN ID 20 (similar setup as eth3, but different network and VLAN-tagging)

eth3 is working and gives adresses to wireless clients via VLAN tagged ports.

eth2 is not working, i get an offer, but nothing more. See log below:

2009:06:16-11:22:17 mail dhcpd: DHCPDISCOVER from 00:1e:c2:1a:31:5a via eth2.20
2009:06:16-11:22:18 mail dhcpd: DHCPOFFER on 192.168.4.200 to 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:22:25 mail dhcpd: DHCPDISCOVER from 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:22:25 mail dhcpd: DHCPOFFER on 192.168.4.200 to 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:22:34 mail dhcpd: DHCPDISCOVER from 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:22:34 mail dhcpd: DHCPOFFER on 192.168.4.200 to 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:22:43 mail dhcpd: DHCPDISCOVER from 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:22:43 mail dhcpd: DHCPOFFER on 192.168.4.200 to 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:23:51 mail dhcpd: DHCPDISCOVER from 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:23:52 mail dhcpd: DHCPOFFER on 192.168.4.200 to 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:23:52 mail dhcpd: DHCPDISCOVER from 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:23:52 mail dhcpd: DHCPOFFER on 192.168.4.200 to 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:23:55 mail dhcpd: DHCPDISCOVER from 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:23:55 mail dhcpd: DHCPOFFER on 192.168.4.200 to 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:23:59 mail dhcpd: DHCPDISCOVER from 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:23:59 mail dhcpd: DHCPOFFER on 192.168.4.200 to 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:24:08 mail dhcpd: DHCPDISCOVER from 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:24:08 mail dhcpd: DHCPOFFER on 192.168.4.200 to 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:24:17 mail dhcpd: DHCPDISCOVER from 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:24:17 mail dhcpd: DHCPOFFER on 192.168.4.200 to 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:24:26 mail dhcpd: DHCPDISCOVER from 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:24:26 mail dhcpd: DHCPOFFER on 192.168.4.200 to 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:24:34 mail dhcpd: DHCPDISCOVER from 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:24:34 mail dhcpd: DHCPOFFER on 192.168.4.200 to 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:24:43 mail dhcpd: DHCPDISCOVER from 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:24:43 mail dhcpd: DHCPOFFER on 192.168.4.200 to 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:24:51 mail dhcpd: DHCPDISCOVER from 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:24:51 mail dhcpd: DHCPOFFER on 192.168.4.200 to 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:25:59 mail dhcpd: DHCPDISCOVER from 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20
2009:06:16-11:26:00 mail dhcpd: DHCPOFFER on 192.168.4.200 to 00:1e:c2:1a:31:5a (TEST-MA) via eth2.20

I've tried with 2 different computers. Neither gets any adress. I've recreated the network several times, with different VLAN TAGS (configured the switch to match tag), and recreated a new DHCP for the network. Still no go.

This morning i rebooted the firewall just to see if it would clear up, but it didn't...

Any suggestions?

Thank you
Last edited by lejzer; 06-16-2009 at 10:27 AM. Reason: Pasted wrong log. Corrected.
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  #2 (permalink)  
Old 06-16-2009, 12:23 PM
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Is this error perhaps not a third DHCP, but a second DHCP on a physical interface? I wonder if that's not a limitation of the DHCP server at present - that only one VLAN on a physical port can have a DHCP server.

Cheers - Bob
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Old 06-16-2009, 12:40 PM
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Thanks. But i did a test and removed the working DHCP with VLAN., and then created a new one for the other network. Still no go.

Once i recreated the old one again, it started to hand out ip-adresses as it used to.

Still the newly created DHCP won't work.. This is ODD. I have doublechecked everything from VLAN-Tags, to ports etc...
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Old 06-16-2009, 01:27 PM
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So, the Guest VLAN DHCP doesn't work even when it's the only DHCP server? What if you delete the VLANs, then set up just the Guest VLAN and create a DHCP server on it?
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Old 06-16-2009, 02:30 PM
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That is correct. But the case is solved. I feel a little embarassed. I have two switches in two locations connected via fiber. There were a little fault in VLAN-configuration of one of the switches. Once corrected it worked.

So i can confirm that it DOES work with two dhcp-servers running different VLAN's.

Case closed!

Thanks anyway.
Last edited by lejzer; 06-16-2009 at 02:30 PM. Reason: Spelling
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Old 06-16-2009, 02:40 PM
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Good work. Thanks for the reminder to check the simple things first when something doesn't work as expected.

Thanks - Bob
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