PC not getting IP due to bad cable

[mahesh18]

Hi everyone,

User is connected to switch 3560 and switch is gettig IP from another switch via DHCP.

I check switch port it has no errors.Port is clean.

When user connects PC to Wall jack i can see switch port is up up and learning mac address of user PC but the user PC is not getting IP address.

We have changed PC also but still same thing.

Only thing that can be issue is cable from patch panel to the wall jack.

DHCP is working fine as other users are getting IP.

Does anyone seen this behaviour where user PC does not get IP due to bad or broken cabling?

[John Blakley]

Mahesh,

Can you statically assign an address and pass traffic? I've seen a bad cable cause the computer to not get a connection to the network, but not disallow just dhcp. If the problem stays at the wall jack, you could run a tester to see where the problem is, but I'm probably leaning toward a new run.

HTH,
John

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[mahesh18]

Hi John,

Will check this as user will be in office on Monday.

Regards

MAhesh

[Reza Sharifi · Accepted solution]

Hi Mahesh,

Usually when connect a PC to a port and the port link light is green and you see the MAC address, the cable is good.

Can you make sure that the PC is not setup for static IP instead of DHCP?

HTH

Reza

[mahesh18]

Hi Reza,

PC is not assigned Static IP.

Regards

MAhesh

[mahesh18]

Hi REza,

Seems Active Firewall which was configured as DHCP had some issues with syn to the standby firewall.

that was causing the issue.

All is good now

Regards

MAhesh

[devils_advocate]

Run a cable test end to end.