Network dropping and switches.

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solarandy

Mar 7, 2018
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Ok current setup computers, IP phones and printers going to 24 port switch(Netgear). Also have a couple more computers and ip phones in another office that I run from the 24 port switch to another 10 port switch and a dedicated server computer going direct to a LinkSys EA8300 router. Had setup all computers and printers with static IP and left the phones and wifi on dynamic. So recently updated our pos software and moved it over to a new dedicated server computer and now hell has broke loose. Pretty much everything is now has unknown network with limited internet. I was able to get the smaller switch work by connect direct to router but other than that I don't know what could be wrong. Have tried switching a few computers back to dynamic and seemed to work for a couple minutes until going lame again. Any advice? My whole network is currently down and going to make running the business pretty rough tomorrow..

Thank you.
 
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solarandy

Mar 7, 2018
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It was set to static and I actually disabled all firewalls on it and opened it to the most sharing as I could. It also seemed pretty random at times as some computers would up up and then a few others down.
 
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camieabz

camieabz

Splendid
Jan 29, 2001
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Well assuming all the routing / configs are the same, the only definite change will be the MAC address of the new system (presumably with a different nic on the motherboard?). Maybe it's an ARP cache issue (given that the switch to switch connectivity is up and down intermittently).

https://www.techrepublic.com/blog/data-center/look-to-the-arp-cache-when-troubleshooting-flaky-connectivity-issues/

Summary:
Neighbor Cache (ARP Cache to us old guys) is a crucial, and often overlooked, component of networking. Having incorrect entries, or a corrupt cache, can cause flaky, inconsistent connectivity on your servers to certain addresses. This can be especially true when a NIC on a server fails over to a second NIC with a different MAC Address. Whenever I am troubleshooting network connectivity on a Windows Server, and the answer eludes my troubleshooting, I will review the Permanent mappings in this cache and delete the dynamic entries and let them rebuild themselves.
Click to expand...
 
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solarandy

Mar 7, 2018
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0
10
So when I got to work this morning I reset the network config on the server and put it on dynamic , disco it all ran the small switch and and server direct to router and turned the router on first and back office worked fine. Plugged in the big switch and everything is peachy.. most of did this like 5 times yesterday and now it works this time. Network scanner showed no conflicts before so no idea what went wrong.
 
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