DNS Error(Destination unreachable(Port unreachable)

MParashar · ‎11-11-2022

Hello Everyone,

I am working on DNS server of our Network. Since fast few days i was observing some port unreachable ICMP requests to DNS server (through packet capture by wireshark). All the requests are destined to DNS server and from different different vlans of the network. Initially, I thought that it could be ping drop requests of DNS server from different IPs of the network due to latency or some other network issue but it was not like that. I have checked the status of ping failed requests on wireshark and that was a totally different entry from the one which i was observing. Can anyone help me in resolving the issue. Screeenshot enclosed.

marce1000 · ‎11-11-2022

- Make sure the DNS service is up and running on the DNS server.

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

Georg Pauwen · ‎11-12-2022

Hello,

where are these ICMP packets coming from ? The packet length (147) looks kind of weird. What if you send a 'regular' ping, e.g.:

ping -l 1472

MHM Cisco World · ‎11-12-2022

Do traceroute to dns server are it stop in your router ?

I think your router is issue