DHCP Issue

[Techdw]

Hi All,

All my PCs are on a scope 10.20.0.10 - 10.20.7.254 but when looking in DHCP today the end IP for 10.20.0 vlan is 10.20.0.254 and the next one given is 10.20.4.1 so 10.20.2 and 10.20.3 are not being used and i have no exclustions.

 

Any one any idea why?

Thanks,

[snagrat]

Another DHCP server somewhere?

[Techdw]

Only have 2 DC's on site.

[ITGURU]

Only have 2 DC's on site.

 

You can have a DHCP server that isn't a DC

[Techdw]

Yes, DHCP is only on the DC's. Built the network from scratch last year.

[snagrat]

Rogue device?

[free780]

Are you using dhcp fail over?

[Techdw]

Yes that is correct

[twin--turbo]

A flat subnet encompassing 10.20.0.10 - 10.20.7.254 if so ( Holly S....)

 

Or do you have individual 10.20.x.x/24 subnets?? with Vlans?

 

TT

[Techdw]

individual 10.20.x.x/24 subnets with Vlans.

[twin--turbo]

so PC's on the vlan served by 10.20.2.x and 10.20.3.x are not receiving any IP's

 

TT

[Techdw]

Vlan the PCs are on is Called 'Vlan 20'

Scope - 10.20.0.10 - 10.20.7.254

 

It will issue Ips out

10.20.0.254

10.20.4.254

 

but it has skipped

10.20.2.0-254 and 10.20.3.0-254

[twin--turbo]

Not sure why you have the specific issue without being able to review the full DHCP config

 

But if that truly is your client subnet then it's horribly large. I never stray past a /24 even using thin terminals.

 

TT