Default gateway internet traffic problems

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Hello,

We have some problems with internet traffic from the real servers.

LoadMaster
ETH0: 172.16.100.x
ETH1: 172.16.200.x

2armed setup on layer 4 for https/http traffic.

The firewall/gateway is on 172.16.100.254 and the realservers are on 172.16.200.x. The realservers has the loadmaster as gateway.

When it is busy with internet traffic (10/20Mbit/s) to the internet (outside from the realservers) it can't sometimes connect to the dest.. server.

The workaround is now that we added an extra ip address on the gateway 172.16.200.254 and make static routes on the real server for some busy addresses to the realgateway 172.16.200.254.

Greetings,

5 comments

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Derek Kiely

Where are the messages "Can't connect to the dest server" seen? On the LoadMaster or on the Real Servers?

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Stèphan Eizinga

On the Realservers from the outside -> Loadmaster -> Realserver has no problems only Realservers -> Outside.

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Derek Kiely

So the issue is only seen when the Real Server sends traffic outbound via the LoadMaster during periods of load?

If this is the case can you please provide the answers to the following

  • What type of connection is the Real Server trying to make that results in this error message?
  • What log files are giving this error on the server?
  • Do you get this on all Real Servers or just some?
  • Are there any logs on the LoadMaster that correlate to this message on the Real Server.
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Stèphan Eizinga

Yes, only with heavy load and when we disable two servers (three servers in total) then the problems are gone.
* Connection is an https connection to an IIS server
* Curl give an connection time-out error
* On all the real servers (three servers)
* No, i can't find any logs that can result to this problem.

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Stèphan Eizinga

Derek, do you have an ideas?