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Odd networking issue

Posted on 2014-12-12
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Last Modified: 2014-12-26
Our main internet connection is Windstream and we have a backup Verizon DSL line.  The Windstream connection uses a Linksys RV220W router.  We manually switch the cable to the DSL Westell router if ever needed.

We were starting to experience random network issues.  Some computers were getting random errors in our Database software and ping tests showed some small packet loss.  When we switch over to DSL, the problems immediately go away.  If we switch back to the Windstream connection, the issues come back, but not right away.  Normally it takes an hour or so but ALWAYS comes back.  We replaced the RV220W router and upgraded the firmware in it.  Our 2 servers are fully patched.   I've done a deep malware scan on both servers.  The only thing that makes sense to me is some kind of flood attach to the Windstream IP address.  Unfortunately the RV220W logs don't tell me much.  Any ideas?
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Question by:seanrhudy
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by:rharland2009
ID: 40497000
What kind of connection is the Windstream pipe? Ethernet handoff, etc.?
Here's a test you could do to at least doublecheck yourself and isolate the issue.
Switch over to DSL for the time being, since that's a stable connection.
Connect a computer or small test network directly to the Windstream pipe, and see if the creeping errors recur, or if it stays clean. You'll likely have to re-address whatever computer you connect to the Windstream pipe unless they hand out DHCP to you, but it'd be a good way to show Windstream 'this connection suffers packet loss/latency/other issues separate of any of our internal infrastructure'.
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by:Fred Marshall
ID: 40497038
Presumably the RV is not set in failover mode, correct?
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by:giltjr
ID: 40497440
What logging options have you enabled on the RV220W?
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by:vivigatt
ID: 40499352
I have had a similar issue with a netgear modem/router.
I disabled IP flood (Syn flood) detection in the firewall settings and now it is much better...
I run a local DNS inside my LAN (behind the NAT) and it seems that DNS queries are detected as "syn-flood" attacks
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by:seanrhudy
ID: 40501742
rharland2009; Yes, it's an ethernet handoff. I switched over to the DSL line and I connected a single laptop with a static IP for testing. So far, everything looks good.

fmarshall: No, it's not in failover mode.

giltjr: I have enabled all logging, but the logging in this device is not the best.  There isn't much in the logs at all.

vivigatt: I disabled Syn Flood detection, but same issues.
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by:vivigatt
ID: 40501752
Have you tried completely disabling the firewall and see if this is any better ?
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seanrhudy earned 0 total points
ID: 40512454
So somebody had plugged in a cheap wireless extender.  The extender was handing out IP's, but what made this hard to figure out is that the DHCP Server listed when I did an IPCONFIG /ALL was the correct server, but wrong info.  We unplugged the extender and the problem was solved.
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by:Fred Marshall
ID: 40513312
What does this mean:
the correct server, but wrong info.
?
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by:vivigatt
ID: 40515142
You meant a rogue DHCP server ?
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Author Closing Comment

by:seanrhudy
ID: 40518239
Unplugging the extender fixed the issue.
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