Hi. I am the admin of a building network with multiple users, each having to go through a router. As far as I can tell, the router is refusing certain IP addresses. This seems to result in two errors. If I ping the router, for some people it will say “Destination Net Unreachable”, in which case I simply reset the user’s IP and then it works, but for some people it says “General Transmit Failure” which is only solved (sometimes) when I reset the router. I assume that both of these are cause by some problem with the router. Also, both of these problems are relatively new. It was working fine a few months ago.
I am fairly inexperienced with this, and I did not install and set up the network or the router, as I inherited the responsibility from someone else, so any assistance would be much appreciated.
There are approximately 160 clients, and there are 8 switches. 20 clients connect to a switch, and then each of those 8 switches connect to another switch, to which the router and a server are connected. As far as I understand the purpose of the router is to assign everyone their IP addresses.
only users from certain building (connected to a individual switch ) are affected ? or all users , I suspect that one of your switch is not working properly .
You stated that the router was refusing ip addresses from the dhcp server. What ip addresses is it refusing? If the dhcp server is attempting to issue a 192.168.0.x/24 ip, and you have a 192.168.0.x/24 localnet on the router, that could cause a problem.
The usual thing I recommend is enable verbose logging on the router. That should tell you what ip is being offered, and possibly why it is being refused.