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Interface not reachable any more

Hello,

i have a strange problem with one of the eight interfaces of my XG135-Appliance

The last three months all was working fine, but since today I have the problem, that i can't reach (ping, tracert) one of my interfaces (config not changed)
So devices connected to this interface cannot establish an internet connection
For testing my notebook is now directly connected to the interface...same problem

I always get "destination host unreachable"

The Interface has the IP 172.30.1.10 /24
DHCP is working fine (range for testing 172.30.1.11-20, /24), i get an IP, but i can't reach the interface-IP and so the gateway for this net

Now the strange part of this:
If i change the IP of the interface from the 172.30.*.* net to another, e.g. 192.168.*.* all is working fine
By changing back to 172.30.*.* i can't reach my interface again


I had this before at the beginning, while testing the XG
At this time i thought i did something wrong, so i reset the XG and all was working fine after this...till now

What i tried to do so far:
- a simple restart of the device ->no change
- disabling/re-enabling the Port ->no change
- disabling interface, restart XG an enable interface -> no change

As workaround, as described above, i changed the ip of the interface to the 192.168.*.* net

Anyone the same issue?
What else can i try to get this working with the original interface config?
If procurable without resetting the device

Thanks
Thomas



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