default gateway dhcp server problems with 7.4.110.0

[baumgartnerm]

Hi together,

I upgraded today my WLC (ISM-SRE-300-K9) from 7.0.220.0 to the current version 7.4.110.0.

All clients are connected, but the default gateway is incorrectly set.

For example my default gateway is 192.168.0.254 (set in the admin-interface)

I get on the client the default gateway: 254.0.168.192

I have already tried to set it incorrect in the admin interface, but the interface says, that this is not allowed.

Any ideas, what I have to do?

Thanks!

Regards,

Manu

[ericgarnel]

check & see what the DHCP server is handing out.

Also, check under WLAN | Advanced tab to see if you are overriding the DHCP settings of the interface

Eric

[baumgartnerm]

Hi Eric,

there is no overriding DHCP server.

The DHCP server is correctly configured and handing out all correct except the gateway...

I've already tried to delete the scope and add a new scope.

Regards,

Manu

[Rasika Nayanajith]

post "show interface detail " output to see what's wrong with it

Rasika

[baumgartnerm]

the gateway ip: 254.0.168.192 was an example.

the gateway ip I get with this configure is: 33.36.168.192

(Cisco Controller) show>interface detailed vlan107

Interface Name................................... vlan107

MAC Address...................................... c8:9c:1d:6a:81:80

IP Address....................................... 192.168.36.10

IP Netmask....................................... 255.255.255.0

IP Gateway....................................... 192.168.36.33

External NAT IP State............................ Disabled

External NAT IP Address.......................... 0.0.0.0

VLAN............................................. 107

Quarantine-vlan.................................. 0

NAS-Identifier................................... SR-WLC-1

Physical Port.................................... 1

DHCP Proxy Mode.................................. Global

Primary DHCP Server.............................. 192.168.250.12

Secondary DHCP Server............................ Unconfigured

DHCP Option 82................................... Disabled

ACL.............................................. Unconfigured

mDNS Profile Name................................ Unconfigured

AP Manager....................................... No

Guest Interface.................................. No

L2 Multicast..................................... Enabled

[kcnajaf]

Hi Manuel,

Little confused here :-(

You mean to say that your interface has the default gateway configured as 192.168.36.33 but your DHCP client is getting the default gateway ip address as 33.36.168.192???

What  DHCP server are you using?

Regards

Najaf

[baumgartnerm]

Hi Najaf,

yes, this is right.

I am using the internal DHCP server of the WLC.

Some further details:

I upgraded from 7.0.240.0 to the current version.

The WLC is a ISM-SRE-300-K9 in a Cisco 1941/K9 and 9 Cisco AIR-LAP1042N-A-K9 Access Points.

Regards,

Manuel

[kcnajaf]

Hi,

Could you please share the output of below command?

show dhcp detailed

Also try deleting this scope and try configuring a new scope with different name and same parameters

Regards

Najaf

[baumgartnerm]

Hi Najaf,

I have already tried to configure a new scope with a different name and same parameters -> same problem.

Here your output:

(Cisco Controller) >show dhcp detailed Mitarbeiter

Scope: Mitarbeiter

Enabled.......................................... Yes

Lease Time....................................... 86400 (1 day )

Pool Start....................................... 192.168.36.100

Pool End......................................... 192.168.36.199

Network.......................................... 192.168.36.0

Netmask.......................................... 255.255.255.0

Default Routers.................................. 192.168.36.33  0.0.0.0  0.0.0.0

DNS Domain....................................... wlan.vn.idowa.de

DNS.............................................. 192.168.1.221  192.168.1.207  0.0.0.0

Netbios Name Servers............................. 0.0.0.0  0.0.0.0  0.0.0.0

Regards,

Manuel

[kcnajaf]

Hi,

That is interesting.

On DHCP scope can you try setting gateway as 33.36.168.192 and verify if clients are getting default gateway as 192.168.36.33 :-)

Regards

Najaf

Sent from Cisco Technical Support iPhone App

[baumgartnerm]

Hi,

I have already tried this...

It's not allowed to set an incorrect gateway...

Regards,

Manuel

[Rob Huffman]

Hi Manu,

Have a look at this 7.4 bug

CSCuh20357

Related Bug Information

7.4 SRE-WLC DHCP Server, default gateway and dns offer reversed

Symptom: An SRE WLC configured as a DHCP Server may offer octet reversed default  gateway and DNS server values (eg 4.3.2.1 instead of 1.2.3.4) Conditions: SRE-WLC running 7.4.100.0 or 7.4.100.60 Workaround: Use an external DHCP server or downgrade to pre 7.4 code. More Info:

Cheers!

Rob

"Your life is worth much more than gold." 

- Bob Marley

[baumgartnerm]

Hi Rob,

thanks for the bug description.

Hopefully it will be fixed in future releases...

Regards,

Manu