Weird network problems > time outs & DHCP not working correctly !?
When I try to ping my servers then I'm getting sometimes immediately a ping reply and sometimes time outs ... the patterns often seem to be ping reply, timeout, ping reply, timeout etc. This happens when pinging anyone of my servers.
Any ideas why?
Also, most of my PCs are not getting IP addresses from the DHCP servers ... how could I find out why that's the case??
Thanks a lot!
Any ideas why?
Also, most of my PCs are not getting IP addresses from the DHCP servers ... how could I find out why that's the case??
Thanks a lot!
I assume from your question this used to work. Nonetheless, make sure (somehow) DHCP scope did not change and that you have enough DHCP addresses to hand out.
.... Thinkpads_User
.... Thinkpads_User
ASKER
Hi,
Yes, all of this worked fine until an electric blackout recently ... the DHCP scope is correct and it also has enough free addresses.
It seems though that one or more switches could be the problem, or part of it. I'm able to ping one server correctly that's very close to me (only one switch, let's call it switch A), but not servers further away. What's weird though is that I sometimes get a ping timeout on switch A as well, although much less ... only 1 in 10 or something like that. The others give me 1 timeout for each successful ping ...
Yes, all of this worked fine until an electric blackout recently ... the DHCP scope is correct and it also has enough free addresses.
It seems though that one or more switches could be the problem, or part of it. I'm able to ping one server correctly that's very close to me (only one switch, let's call it switch A), but not servers further away. What's weird though is that I sometimes get a ping timeout on switch A as well, although much less ... only 1 in 10 or something like that. The others give me 1 timeout for each successful ping ...
So then given your further explanation above, you appear to have a network problem, and the power outage (or the surge on power back) may have damaged a switch. I have seen that before. So you need to get one or two new switches and begin replacing and testing suspect switches.
.... Thinkpads_User
.... Thinkpads_User
This is definitely switch problem (malfunctioning).
You can reboot the switch (probably rebuild its configuration) where DHCP server is connected and test other computers on the same switch
Post switch reboot, the client computers on the same switch should get DHCP lease hopefully
Mahesh
You can reboot the switch (probably rebuild its configuration) where DHCP server is connected and test other computers on the same switch
Post switch reboot, the client computers on the same switch should get DHCP lease hopefully
Mahesh
Make sure the duplex settings on the switches and routers are not mismatched. Use Auto negotiate.
Your DHCP problem may be a different problem. It might stem from having a rogue DHCP server on the network. Use your servers for DHCP and make sure the switches/routers are not providing DHCP. There is a reason for the servers.
Your DHCP problem may be a different problem. It might stem from having a rogue DHCP server on the network. Use your servers for DHCP and make sure the switches/routers are not providing DHCP. There is a reason for the servers.
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ASKER
I solved it myself
If the Server is working well, take a good PC to a switch very near the server and try it. You could have a problem in the switch network that would take some process of elimination to determine where.
.... Thinkpads_User