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06/26/2009 at 07:52AM PDT, ID: 24525328
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8.1

FreeBSD gateway/routed connections

Asked by oobayly in FreeBSD, DSL Lines / Cable Internet, TCP/IP

Tags: FreeBSD TCP ipnat routing gateway

I've a FreeBSD machine to be set up as a firewall/router box for our office. It's using 7.2 with a generic kernel (for the moment). It routes all traffic to the internet via an ADSL modem in bridging mode (as all outbound connections are NATed to our fixed IP).

Everything seems to be working fine apart from an issue with TCP connections remaining ESTABLISHED on client machines.

For example, we have a .Net app that connects to a MySQL database. Very occasionally, if there's a hiccup on the line, the app will freeze. Using Netstat, Process Explorer or TCP View from Systinternals, I can see that the connection to the MySQL server is ESTABLISHED.
The same also happens on a Linux machine in our network that hosts another MySQL database which replicates the remote DB.
Note, this is rare behaviour as normally what happens is that the connection is closed due a TCP ACK not being received after the given number of retries.
I'm assuming the client freezes as it's waiting for data to be sent, as when I use tcpdump (or Wireshark on a Windows machine), I see that no traffic is being sent.

However, when I log onto the remote MySQL server, I can see that that ip/port is no longer connected. Netstat on the server also shows that the connection is no longer there.

Can anyone suggest why the client's TCP connection is still established, while the connection at the server end appears to have been reset.

I also can't for the life of me find out how to list all the connections that are using the FreeBSD machine as a gateway to the internet. netstat -naf inet only shows connections where the FreeBSD machine is one of the endpoints.
[+][-]06/27/09 05:32 AM, ID: 24727445

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Zones: FreeBSD, DSL Lines / Cable Internet, TCP/IP
Tags: FreeBSD TCP ipnat routing gateway
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Solution Provided By: gheist
Participating Experts: 1
Solution Grade: A
 
 
[+][-]07/12/09 04:56 AM, ID: 24834092

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[+][-]07/12/09 05:20 AM, ID: 24834153

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[+][-]07/12/09 02:13 PM, ID: 24835859

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[+][-]07/13/09 02:03 AM, ID: 24838023

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[+][-]07/13/09 03:42 AM, ID: 24838512

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[+][-]07/13/09 04:04 AM, ID: 24838600

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[+][-]07/13/09 05:13 AM, ID: 24838924

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