<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML ><HEAD ><TITLE >Problems with IP Masquerade </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="Other IP Masquerade Issues and Software Support " HREF="ipmasq-support-portfw-and-stronger-rulesets.html"><LINK REL="PREVIOUS" TITLE="Other IP Masquerade Issues and Software Support " HREF="ipmasq-support-portfw-and-stronger-rulesets.html"><LINK REL="NEXT" TITLE="Incoming services " HREF="incoming-services.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="ipmasq-support-portfw-and-stronger-rulesets.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 6. Other IP Masquerade Issues and Software Support</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="incoming-services.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="IPMASQ-PROBLEMS" ></A >6.1. Problems with IP Masquerade</H1 ><P >Some TCP/IP application protocols will not currently work with Linux IP Masquerading because they either assume things about port numbers or encode TCP/IP addresses and/or port numbers in their data stream. These latter protocols need specific proxies or IP MASQ modules built into the masquerading code to make them work.</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="ipmasq-support-portfw-and-stronger-rulesets.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="incoming-services.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Other IP Masquerade Issues and Software Support</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ipmasq-support-portfw-and-stronger-rulesets.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Incoming services</TD ></TR ></TABLE ></DIV ></BODY ></HTML >