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DHCP Server works what they want... Issue with DHCP lease

Hello everybody,

On the beginnig I want to imagine my issue with DHCP Server on XG 210. First, I have all setup as in manual. DHCP server on XG with address scope on VLAN. And then. I have two VLAN's, 10 & 100. For those VLAN's I made DHCP server's with their range. For VLAN 10 is all works fine. But in VLAN 100 I have issue with lease addresses. Some computers let the IP address but other doesn't. All day I have searching the ideas also on this forum and I have't any idea whats going wrong. I am wondering about this situation when I have these same configuration on both networks, but one doesn't work as the second.

My network:

On port1:

VLAN10 - 192.168.10.0

VLAN100 - 192.168.0.0

DHCP scope for VLAN10: 192.168.10.50 - 100

DHCP scope for VLAN100: 192.168.0.150 - 220

TAGS are setup properly on switchs

Also tried with dhcp-scope from CLI, but with no result.

Sophos XG 210 with 17.5.3 MR-3

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0 Badrobot over 6 years ago

So DHCP is workig for 192.168.10.50-100 but not for 192.168.0.150-220?

Is there anything different with the computers that like the new scope vs the ones that do not? Have you cleaned out the ARP Table on all the switches/computers involved?
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0 ChrissBook over 6 years ago in reply to Badrobot

Yes, but in 0.X not working for all clients.

No, all is the same.

But, I didn't clean ARP on switches... maybe it is... For sure I look at dhcpd.leases entries and... there also everything looks good. I'll see tomorrow how to behave my clients again and I let you know. I think that is an error somewhere in DHCP lease list(?) or maybe one client let two leases.
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0 rfcat_vk over 6 years ago in reply to ChrissBook

Do you have static addressing enabled, and are clients moving between VLANs?

Ian
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0 ChrissBook over 6 years ago in reply to rfcat_vk

No I haven't and yes they moving between VLAN's
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0 ChrissBook over 6 years ago in reply to rfcat_vk

No I haven't and yes they moving between VLAN's
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0 rfcat_vk over 6 years ago in reply to ChrissBook

Hi,

if they do not perform renew when moving they will keep the same address on the new VLAN.

Ian
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0 ChrissBook over 6 years ago in reply to rfcat_vk

hmm... but they recive lease from new range when they change the new VLAN (10) and everything was good. Also some clients back to the VLAN (100) let the leases, but others doesn't. For example my computer yesterday let the lease but not today. When I look at Neighbors-ARP cache yesterdays IP is, but sophos cannot let me lease. Also this address is free and ready to use by DHCP.
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0 rfcat_vk over 6 years ago in reply to ChrissBook

Hi,

this does not sound like an XG issue, but more about switch configuration?

How many users and what type of equipment are they using?

Ian
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0 Badrobot over 6 years ago in reply to rfcat_vk

I agree the VLAN config on XG is pretty straight forward, if you can get away with it I would set up a test computer off the first switch you have down the line and get that working then work your way through any other switches down the line.,
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0 ChrissBook over 6 years ago in reply to Badrobot

Hi,

Problem solved. It seems like a vlan tag was lost on ubiquiti AP. After reconfiguration everythings seems to work properly. Thank you so much for help & time :)
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