Strange routing issue on VLAN

[CliveG]

I have 2 servers. Here are the pretend IPs:

10.10.10.8/24

10.10.10.100/24

These two addresses are connected to 2 interfaces on the same L3 switch under VLAN10 (also the gateway 10.10.10.1/24)

I have my PC (192.168.32.10/24) connected to another port on the same L3 switch under VLAN32 (also the gateway 192.168.32.1/24).

With the routing being exactly the same to both end points in VLAN10 (Connected distributed into IS-IS) could some please explain to me why I can and cannot do the following:

From my PC:

I can traceroute and ping to 10.10.10.8

I cannot traceroute or ping to 10.10.10.100

From the L3 switch:

I can ping directly to both 10.10.10.8 and 10.10.10.100. But, if I use the source VLAN as VLAN32 I can ping 10.10.10.8 but not 10.10.10.100.

This has started to annoy me now as if I can ping one, when they are bothe configured exactly the same, I should be able to ping the other. There is something not right on the switch but I cannot see or find what that is.

Any ideas of where to troubleshoot please?

[balaji.bandi]

I cannot traceroute or ping to 10.10.10.100

first this bring to me that, what is this device, check any Local Firewall enabled which prevent this.

please confirm from  this device  10.10.10.100 ( are you able to ping rest of the network like other VLAN IP address ?)

[CliveG · Accepted solution]

Many thanks for the reply.

Looks like it was the Ubuntu server in the end. It was doing something strange with the routing. Rebuilt, re-configured and it now all works perfectly.

Weird.

Many thanks for the help.

[balaji.bandi]

Ok glad you able to resolve, when you install

ubuntu - iptables

or

ufw

will be installed so that may block some time.

any way it resolved now.