<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML ><HEAD ><TITLE >( Timeouts ) - Connections seem to break if I don't use them often. Why is that?</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="Linux IP Masquerade HOWTO" HREF="index.html"><LINK REL="UP" TITLE="Frequently Asked Questions" HREF="faq.html"><LINK REL="PREVIOUS" TITLE="( Distro Setup ) - How can I get IP Masquerade running on Redhat, Debian, Slackware, etc.?" HREF="distro-specific.html"><LINK REL="NEXT" TITLE="( Odd Behavior ) - When my Internet connection first comes up, nothing works. If I try again, everything then works fine. Why is this?" HREF="masq-behavior.html"></HEAD ><BODY CLASS="SECT1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Linux IP Masquerade HOWTO</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="distro-specific.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 7. Frequently Asked Questions</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="masq-behavior.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="MASQ-TIMEOUTS" ></A >7.13. ( Timeouts ) - Connections seem to break if I don't use them often. Why is that?</H1 ><P >IP Masq, by default, sets its timers for TCP session, TCP FIN, and UDP traffic to 15 minutes. It is recommend to use the following settings (as already shown in this HOWTO's /etc/rc.d/rc.firewall-* ruleset) for most users:</P ><P >Linux 2.4.x with IPTABLES</P ><P ><TABLE BORDER="1" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="SCREEN" >IPMASQ timeouts are NOT adjustable under IPTABLES</PRE ></FONT ></TD ></TR ></TABLE ></P ><P >Linux 2.2.x with IPCHAINS:</P ><P ><TABLE BORDER="1" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="SCREEN" ># MASQ timeouts # # 2 hrs timeout for TCP session timeouts # 10 sec timeout for traffic after the TCP/IP "FIN" packet is received # 60 sec timeout for UDP traffic (MASQ'ed ICQ users must enable a 30sec # firewall timeout in ICQ itself) # /ipchains -M -S 7200 10 60</PRE ></FONT ></TD ></TR ></TABLE ></P ><P >Linux 2.0.x with IPFWADM:</P ><P ><TABLE BORDER="1" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="SCREEN" ># MASQ timeouts # # 2 hrs timeout for TCP session timeouts # 10 sec timeout for traffic after the TCP/IP "FIN" packet is received # 60 sec timeout for UDP traffic (MASQ'ed ICQ users must enable a 30sec # firewall timeout in ICQ itself) # /sbin/ipfwadm -M -s 7200 10 60</PRE ></FONT ></TD ></TR ></TABLE ></P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="distro-specific.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="masq-behavior.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >( Distro Setup ) - How can I get IP Masquerade running on Redhat, Debian, Slackware, etc.?</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="faq.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >( Odd Behavior ) - When my Internet connection first comes up, nothing works. If I try again, everything then works fine. Why is this?</TD ></TR ></TABLE ></DIV ></BODY ></HTML >