computer gets IP address but no network connectivity

[Chris_Carroll]

Hi,

I am having an issue where new computers obtain the correct IP information on our wired network. IP address, mask, Gateway, DNS, etc. The problem is that I cannot ping the gateway. Only other devices that are on the same subnet.

I have been able to work around it but that is not consistent. On the problem devices I have cleared the arp table, purged and reload the remote cache table, flushed dns, and removed the ethernet adapter via the device manager then re-added it. Sometimes these methods work and other times they do not

We have a back up Comcast network and the computers work normally when connected there. Even prior to using the methods listed above. So my thought is that there is some sort of incompatibility between the computers and our Extreme switches.

The computers are Dell Latitude 5480 and 5580s and some Mac devices.
We use Extreme X460-G2 switches running firmware version 22.2.1.5.

Any thoughts on this would be greatly appreciated.

Thanks!

[davidj_cogliane]

Chris,

I know you indicated you see this problem with new computers, what happens if you plug a different machine into the same port. Do some machines work and some fail on the same port?

Do you have any lag groups configured? If it is only certain machines I wonder if it is because of their MAC addresses that there traffic is getting lost.

I have seen a static lag get plugged in wrong on one end which led to a switch sending traffic to no-where.

[Chris_Carroll]

Yes, the problem computers connect to VLAN 130. The 10.130.0.254 address was configured on VLAN 130 so that I could use the iparp command to see other devices within the 10.130.x.x subnet. It has been configured that way for quite awhile now.

All other devices can ping 10.130.0.1.

[davidj_cogliane]

Chris,

So the computers are on VLAN 130 and connected to the edge switch shown above?

Try
from the switch pictured above. Does that work?

I noticed this is a /21 and everything else is a /16. Is that the correct configuration? Is that consistent all the way through?

[Chris_Carroll]

Right, the gateway is on the same subnet but the computer still cannot ping that or anything else outside the subnet. Here is the chain: Computer > X460-G2 > S-Series core router. I am positive that the VLANs are correctly configured. The switch and other devices that connect to the switch can ping the gateway and have network connectivity. It is just these new computers.

[Ronald_Dvorak]

Could you provide a network diagram - is the default gateway the XOS switch ?

Please provide a screenshot of "show vlan" and tell us which VLAN/IP we are talking about.

-Ron