no  ip address when changed vlan

venkata ramana
venkata ramana used Ask the Experts™
on
laptop been moved from production to a another segment for testing purpose .but when changed vlan of other segment the laptop cannot get ip address. when reverted back to old vlan connected to network & obtained ip.
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DP230Network Administrator

Commented:
Did you restart your Network adapter? Is the DHCP server available?

What happens if you set up IP address manually?

Author

Commented:
rebooted the laptop many times shows connected status on switch port end
Tom CieslikIT Engineer
Distinguished Expert 2017

Commented:
Try this
Run CMD as administrator
Connect laptop to network where you can;t get IP

try this commands


ipconfig /flushdns
ipconfig / release
ipconfig /renew

double check if in new VLAN there is no restrictions for connection and any MAC address filter is not enabled.
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Author

Commented:
cannot set up ip address manually as having no admin privilege laptop nic no issues as obtaining ip from other vlan segments,not working when changed to this (Sit)lan segment
Tom CieslikIT Engineer
Distinguished Expert 2017

Commented:
There is no much you can do if you're not local admin
Are you sure other devices like laptops, tablets, smartphones can connect to this network and get IP from DHCP ?

Author

Commented:
No other ports in switch assigned for this vlan , this is the first port I moved to this new vlan not works reverted back to old vlan works getting ip from dhcp
Is the dhcp server in the same subnet? You may need an ip helper-address command on the SVI to forward broadcasts to the dhcp server. If it's a Cisco switch see below commands

Interface vlan 100
Ip helper-address a.b.c.d

Where a.b.c.d is the IP address of the dhcp server
Network Administrator
Commented:
Seems like the IP address was setup static, then it cannot change when change the VLAN.

You have to get Local admin right to troubleshoot.

Author

Commented:
Ok noted Tks
DP230Network Administrator

Commented:
Did you solve it? Should we close this case?

Author

Commented:
can close Tks I'll still waiting for user updates

Author

Commented:
Tks

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