Local LAN hanging when possible ISP drop-out occurs
by mfoley from LinuxQuestions.org on (#4QP78)
I've been having troubles with my Internet connection for the past 15 days, which I'm trying to work through in a different thread. This present issue has to do with the various computers on my local network.
My ISP has been apparently dropping my connection from 1-5 minutes in duration (and up to 1/2 an hour) intermittently, several times during the day. Connection drop-out occur from between several minutes up to several hours with the average interval being 2-3 hours. This could be the ISP, or it could be some other hardware issue.
My problem is this: when that happens. None of the computers on the LAN can see or talk to each other until Internet connection is restored and I can do no work on LAN hosts except on the computer I'm physically sitting in front of and logged into. If I'm ssh'd from one local computer into another, I cannot type anything. scp's from one local computer to another stop. Samba mounts are unavailable. Cellphones using wireless lose connection (but note that the computers themselves are hard-wired, not wireless).
At first I thought my ASUS RT-AC66U was getting old and hanging up, so I bought a new ASUS RT-N66U. That didn't solve the problem at all.
I don't get this, because the LAN hosts are 192.168.0.0/24 and they should all be able to see and talk to each other, even if they can't get to the internet.
The ASUS router is the DHCP server and gateway. As such it would route DNS resolution upstream to the ISP. Four of the primary hosts are configured in the ASUS with static IPs.
If the ISP drops connection, why would I not be able to still communicate within the LAN? I cannot do so even if I bypass name resolution and use the hosts' actual IP address. Could the ASUS, being the router/gateway, be the problem? If so, why? It should be routing LAN internally, not hanging the LAN because of no Internet connection.
What can I do to diagnose the problem and fix this?
My ISP has been apparently dropping my connection from 1-5 minutes in duration (and up to 1/2 an hour) intermittently, several times during the day. Connection drop-out occur from between several minutes up to several hours with the average interval being 2-3 hours. This could be the ISP, or it could be some other hardware issue.
My problem is this: when that happens. None of the computers on the LAN can see or talk to each other until Internet connection is restored and I can do no work on LAN hosts except on the computer I'm physically sitting in front of and logged into. If I'm ssh'd from one local computer into another, I cannot type anything. scp's from one local computer to another stop. Samba mounts are unavailable. Cellphones using wireless lose connection (but note that the computers themselves are hard-wired, not wireless).
At first I thought my ASUS RT-AC66U was getting old and hanging up, so I bought a new ASUS RT-N66U. That didn't solve the problem at all.
I don't get this, because the LAN hosts are 192.168.0.0/24 and they should all be able to see and talk to each other, even if they can't get to the internet.
The ASUS router is the DHCP server and gateway. As such it would route DNS resolution upstream to the ISP. Four of the primary hosts are configured in the ASUS with static IPs.
If the ISP drops connection, why would I not be able to still communicate within the LAN? I cannot do so even if I bypass name resolution and use the hosts' actual IP address. Could the ASUS, being the router/gateway, be the problem? If so, why? It should be routing LAN internally, not hanging the LAN because of no Internet connection.
What can I do to diagnose the problem and fix this?