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396
Views
5
Helpful
6
Replies

DHCP Issue on a wireless subnet via WLC 3504

Kim131
Level 1
Level 1

Hey guys,

I have a DHCP issue on one of the subnets 10.0.1.0/22. IP addresses are released well however only with IP addresses between 10.0.1.1-254 are able to access internet ( browse ) the rest of the users up to 10.0.3.254 cannot browse. tried to queries DNS records for a particular domain name using NSLOOPUP but still it is not working.

your assistance, please 

4 Accepted Solutions

Accepted Solutions

RoadRunner4k
Level 1
Level 1

Which software are you running ? and is there an external DHCP handing out the IPs? 

Is the mask correct on clients not able to access internet ? 

Do you got a firewall / router infront to NAT users to internet ? then check if they allow the full subnet of /22

 

 

View solution in original post

90% of this issue is from the different mask between 
1- GW interface 
2- DHCP Pool 
3- NAT list 
this mismatch lead to this case 
MHM

View solution in original post

Haydn Andrews
VIP Alumni
VIP Alumni

Sounds like the subnet mask or the gateway is incorrect in the DHCP scope.

Or upstream firewall/ NAT rule has wrong mask for the subnet

*****Help out other by using the rating system and marking answered questions as "Answered"*****
*** Please rate helpful posts ***

View solution in original post

Kim131
Level 1
Level 1

Hi Guys,

Thank you very much for your responses. it was the wrong subnet mask on the interface gateway on the firewall.  It was /24 instead of /22.

View solution in original post

6 Replies 6

RoadRunner4k
Level 1
Level 1

Which software are you running ? and is there an external DHCP handing out the IPs? 

Is the mask correct on clients not able to access internet ? 

Do you got a firewall / router infront to NAT users to internet ? then check if they allow the full subnet of /22

 

 

90% of this issue is from the different mask between 
1- GW interface 
2- DHCP Pool 
3- NAT list 
this mismatch lead to this case 
MHM

Haydn Andrews
VIP Alumni
VIP Alumni

Sounds like the subnet mask or the gateway is incorrect in the DHCP scope.

Or upstream firewall/ NAT rule has wrong mask for the subnet

*****Help out other by using the rating system and marking answered questions as "Answered"*****
*** Please rate helpful posts ***

Rich R
VIP
VIP

Kim131
Level 1
Level 1

Hi Guys,

Thank you very much for your responses. it was the wrong subnet mask on the interface gateway on the firewall.  It was /24 instead of /22.

You are so welcome 
MHM

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