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authorfnm3 <fnm3>2003-02-08 15:08:34 +0000
committerfnm3 <fnm3>2003-02-08 15:08:34 +0000
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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+ <HEAD>
+ <TITLE>Ebtables (Ethernet Bridge Tables) Frequently Asked
+ Questions</TITLE>
+ <LINK rel="SHORTCUT ICON" href="">
+ <LINK rel="STYLESHEET" type="text/css" href="ebtables.css">
+ <META name="description" content=
+ "Ethernet Bridge Tables Frequently Asked Questions">
+ <META name="author" content="Nick Fedchik">
+ <META name="keywords" content=
+ "Linux, netfilter, firewall, bridge, brouter, ebtables, iptables">
+ <META name="keywords" content=
+ "FAQ, kernel, br-nf, br-nf-bds, ethernet, nat, chains, rules, tables">
+ </HEAD>
+ <BODY>
+ <DIV class="banner" align="center">
+ <H1>Ebtables (Ethernet Bridge Tables) Frequently Asked Questions</H1>
+ </DIV>
+ <A name="top"></A>
+ <H2>Questions</H2>
+ <OL>
+ <LI><A href="#quiz0">Intro</A></LI>
+ <LI><A href="#quiz1">Installation</A></LI>
+ <LI><A href="#quiz2">Usage</A></LI>
+ <LI><A href="#quiz3">Other</A></LI>
+ </OL>
+ <H2>Answers</H2>
+ <OL>
+ <LI>
+ <B><A name="quiz0">Intro</A></B>
+ <DL>
+ <DT>What is the ebtables?</DT>
+ <DD>The ebtables project is the Linux 2.4.x Link Layer
+ firewalling subsystem. It delivers for Linux the functionality of
+ Ethernet frame filtering, all kinds of frame NAT (Network Address
+ Translation) and frame matching. Currently ebtables is not a part
+ of 2.4.x kernels, but now in the &gt;=2.5.40 kernels.</DD>
+ <DT>Why do I use it?</DT>
+ <DD>Probably, to filter frames by MAC-address or frame type at
+ Link Layer inside Your Linux-based Ethernet bridge.</DD>
+ </DL>
+ <A class=navbar href="#top">[Back to the top]</A>
+ <HR>
+ </LI>
+ <LI>
+ <B><A name="quiz1">Installation</A></B>
+ <DL>
+ <DT>What should I do to know before ebtables installation?</DT>
+ <DD>First step is to check what the kernel version will be used
+ with ebtables. If the kernel version above than 2.5.39 was
+ installed, then kernel sources need no to be patched by the
+ <B>ebtables_kernel</B> and <B>br-nf-bds</B> patches. Go to <A
+ href="">Ethernet bridge
+ tables</A> and download <B>br_nf_bds</B>, <B>ebtables_kernel</B>
+ and <B>ebtables</B> packages.</DD>
+ <DT>What is the "ebtables_kernel" package and why should I use
+ it?</DT>
+ <DD>
+ The <B>ebtables_kernel</B> package contains a patch against a
+ Linux kernel. It allows filtering on the Link Layer (OSI Layer
+ 2). Well know that iptables works on the Network Layer (OSI
+ Layer 3) and on the upper layers. For a bridging firewall it is
+ important to be able to filter on Link Layer as well. Copy
+ patch file to the kernel source (usually it named
+ /usr/src/linux or /usr/src/linux-2.X.YY) and execute
+# cp ebtables-v2.0.003_vs_2.4.20.diff.gz /usr/src/linux
+# gunzip ebtables-v2.0.003_vs_2.4.20.diff.gz
+# patch -p1 &lt; ebtables-v2.0.003_vs_2.4.20.diff
+ </DD>
+ <DT>What is the "br-nf-bds" package and why should I use it?</DT>
+ <DD>
+ The <B>br-nf-bds</B> package contains a patch against Linux
+ kernel that is already patched with the <B>ebtables_kernel</B>
+ patch. It add ability of iptables usage on a bridge to make a
+ bridging firewall. The big part of this patch was complete by
+ Lennert Buytenhek. The bridge-nf code is automatically compiled
+ into the patched kernel if the bridge and netfilter support is
+ enabled.
+# cp bridge-nf-0.0.10-against-2.4.20.diff.gz /usr/src/linux
+# gunzip bridge-nf-0.0.10-against-2.4.20.diff.gz
+# patch -p1 &lt; bridge-nf-0.0.10-against-2.4.20.diff
+ </DD>
+ <DT>What is the "ebtables" package and why should I use it?</DT>
+ <DD>
+ The <B>ebtables</B> package contains the ebtables userspace
+ tool. Namelly this ebtables binary is used to make filtering
+ rules for the Linux-based Ethernet bridge. The rules is applied
+ for bridged packets at Link Layer. The ebtables usage is very
+ similar to the iptables, so it should not be so hard. Of
+ course, there is a man page supplied. Just gunzip and untar the
+ package and read the INSTALL file.<BR>
+# make
+ Put ebtables binary to the superuser binaries directory (f.e.
+ /usr/sbin) manually or
+# make install
+ </DD>
+ </DL>
+ <A class=navbar href="#top">[Back to the top]</A>
+ <HR>
+ </LI>
+ <LI>
+ <B><A name="quiz2">Usage</A></B>
+ <DL>
+ <DT>Can I drop the ARP packets in linux bridge box using the
+ ebtables?</DT>
+ <DD>Yes, it's possible to filter the ARP packets (same as any
+ other Ethernet frames) using linux bridge and ebtables together.
+ According to the rule target, the frame can be dropped, accepted,
+ passed to next rule, etc.<BR>
+ See the <A href="ebtables.8.html">ebtables manual page</A> for
+ details.</DD>
+ <DT>Can I use ebtables with iptables? Is there any problems to
+ use it together?</DT>
+ <DD>Yes, it's possible to use ebtables with iptables. Detailed
+ info about ebtables/iptables interaction is explained at the page
+ <A href="br_fw_ia.html">"ebtables/iptables interaction on a
+ Linux-based bridge"</A></DD>
+ <DT>Can ebtables to do a frame accounting on my bridge?</DT>
+ <DD>
+ Yes, it's possible to view bridged frames and bytes count by
+# ebtables -L --Lc
+ </DD>
+ </DL>
+ <BR>
+ <A class=navbar href="#top">[Back to the top]</A>
+ <HR>
+ </LI>
+ <LI>
+ <B><A name="quiz3">Other</A></B><BR>
+ <DL>
+ <DT>I'm not a Linux system programer, but I need a feature, which
+ is not (yet) implemented in the ebtables. What should I do?</DT>
+ <DD>Contact by email to ebtables developers directly or subscribe
+ to the <A href=
+ "">ebtables
+ users mail list</A>. Then post short and clean description of
+ Your wanted feature to mail list.</DD>
+ <DT>I'm Linux system programmer and I can do any ebtables feature by
+ myself. What I should begin in that case?</DT>
+ <DD>Subscribe to the <A href=
+ "">ebtables
+ developers mail list</A>. Learn the <A href=
+ "ebtables-hacking-HOWTO.html">"Ebtables Hacking HOWTO"</A>.
+ Create Your account at (if You still haven't it)
+ and inform the Project Admin about Your intention to join to
+ ebtables developers and to make a new ebtables feature. After
+ that You should be able to working with ebtables source code,
+ which is placed at SourceForge cvs repository. Now You can make
+ Your ebtables feature or anything else (to drink a cup of coffee,
+ f.e. ;).</DD>
+ </DL>
+ <BR>
+ <A class=navbar href="#top">[Back to the top]</A>
+ </LI>
+ </OL>
+ <HR>
+ </BODY>