%general-entities; ]> $LastChangedBy$ $Date$ iptables iptables is a userspace command line program used to configure Linux 2.4 and later kernel packet filtering ruleset. &lfs91_checked; Package Information Download (HTTP): Download (FTP): Download MD5 sum: &iptables-md5sum; Download size: &iptables-size; Estimated disk space required: &iptables-buildsize; Estimated build time: &iptables-time; iptables Dependencies Optional (required for nfsypproxy support), bpf-utils (required for Berkely Packet Filter support), libnfnetlink (required for connlabel support), and libnetfilter_conntrack" (required for connlabel support) User Notes: A firewall in Linux is accomplished through the netfilter interface. To use iptables to configure netfilter, the following kernel configuration parameters are required: [*] Networking support ---> [CONFIG_NET] Networking Options ---> [*] Network packet filtering framework (Netfilter) ---> [CONFIG_NETFILTER] [*] Advanced netfilter configuration [CONFIG_NETFILTER_ADVANCED] Core Netfilter Configuration ---> <*/M> Netfilter connection tracking support [CONFIG_NF_CONNTRACK] <*/M> Netfilter Xtables support (required for ip_tables) [CONFIG_NETFILTER_XTABLES] <*/M> LOG target support [CONFIG_NETFILTER_XT_TARGET_LOG] IP: Netfilter Configuration ---> <*/M> IP tables support (required for filtering/masq/NAT) [CONFIG_IP_NF_IPTABLES] Include any connection tracking protocols that will be used, as well as any protocols that you wish to use for match support under the "Core Netfilter Configuration" section. iptables The installation below does not include building some specialized extension libraries which require the raw headers in the Linux source code. If you wish to build the additional extensions (if you aren't sure, then you probably don't), you can look at the INSTALL file to see an example of how to change the KERNEL_DIR= parameter to point at the Linux source code. Note that if you upgrade the kernel version, you may also need to recompile iptables and that the BLFS team has not tested using the raw kernel headers. Install iptables by running the following commands: ./configure --prefix=/usr \ --sbindir=/sbin \ --disable-nftables \ --enable-libipq \ --with-xtlibdir=/lib/xtables && make This package does not come with a test suite. Now, as the root user: make install && ln -sfv ../../sbin/xtables-legacy-multi /usr/bin/iptables-xml && for file in ip4tc ip6tc ipq xtables do mv -v /usr/lib/lib${file}.so.* /lib && ln -sfv ../../lib/$(readlink /usr/lib/lib${file}.so) /usr/lib/lib${file}.so done --disable-nftables: This switch disables building nftables compat. --enable-libipq: This switch enables building of libipq.so which can be used by some packages outside of BLFS. --with-xtlibdir=/lib/xtables: Ensure all iptables modules are installed in the /lib/xtables directory. --enable-nfsynproxy: This switch enables installation of nfsynproxy SYNPROXY configuration tool. ln -sfv ../../sbin/xtables-legacy-multi /usr/bin/iptables-xml: Ensure the symbolic link for iptables-xml is relative. Installed Programs Installed Libraries Installed Directories ip6tables, ip6tables-restore, ip6tables-save, iptables, iptables-restore, iptables-save, iptables-xml, nfsynproxy (optional) and xtables-multi libip4tc.so, libip6tc.so, libipq.so, libiptc.so, and libxtables.so /lib/xtables and /usr/include/libiptc Short Descriptions iptables is used to set up, maintain, and inspect the tables of IP packet filter rules in the Linux kernel. iptables iptables-restore is used to restore IP Tables from data specified on STDIN. Use I/O redirection provided by your shell to read from a file. iptables-restore iptables-save is used to dump the contents of an IP Table in easily parseable format to STDOUT. Use I/O-redirection provided by your shell to write to a file. iptables-save iptables-xml is used to convert the output of iptables-save to an XML format. Using the iptables.xslt stylesheet converts the XML back to the format of iptables-restore. iptables-xml ip6tables* are a set of commands for IPV6 that parallel the iptables commands above. ip6tables nfsynproxy (optional) configuration tool. SYNPROXY target makes handling of large SYN floods possible without the large performance penalties imposed by the connection tracking in such cases. nfsynproxy xtables-multi is a binary that behaves according to the name it is called by. xtables-multi