Copyright © 2001-2004 Thomas M. Eastep
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover, and with no Back-Cover Texts. A copy of the license is included in the section entitled “GNU Free Documentation License”.
2004-11-01
Note
For information regarding configuring and building GNU/Linux kernels, see http://www.kernelnewbies.org.
Here's a screen shot of my Network Options Configuration:
While not all of the options that I've selected are required, they should be sufficient for most applications. Here's an excerpt from the corresponding .config file (Note: If you are running a kernel older than 2.4.17, be sure to select CONFIG_NETLINK and CONFIG_RTNETLINK):
# # Networking options # CONFIG_PACKET=y # CONFIG_PACKET_MMAP is not set # CONFIG_NETLINK_DEV is not set CONFIG_NETFILTER=y # CONFIG_NETFILTER_DEBUG is not set CONFIG_FILTER=y CONFIG_UNIX=y CONFIG_INET=y CONFIG_IP_MULTICAST=y CONFIG_IP_ADVANCED_ROUTER=y CONFIG_IP_MULTIPLE_TABLES=y CONFIG_IP_ROUTE_FWMARK=y CONFIG_IP_ROUTE_NAT=y CONFIG_IP_ROUTE_MULTIPATH=y CONFIG_IP_ROUTE_TOS=y CONFIG_IP_ROUTE_VERBOSE=y # CONFIG_IP_ROUTE_LARGE_TABLES is not set # CONFIG_IP_PNP is not set CONFIG_NET_IPIP=y CONFIG_NET_IPGRE=y # CONFIG_NET_IPGRE_BROADCAST is not set # CONFIG_IP_MROUTE is not set # CONFIG_ARPD is not set CONFIG_INET_ECN=y CONFIG_SYN_COOKIES=y
Here's a screen shot of my Netfilter configuration:
Note that I have built everything I need as modules. You can also build everything into your kernel but if you want to be able to deal with FTP running on a non-standard port then you must modularize FTP Protocol support.
Here's the corresponding part of my .config file:
# # IP: Netfilter Configuration # CONFIG_IP_NF_CONNTRACK=m CONFIG_IP_NF_FTP=m CONFIG_IP_NF_AMANDA=m CONFIG_IP_NF_TFTP=m # CONFIG_IP_NF_IRC is not set # CONFIG_IP_NF_QUEUE is not set CONFIG_IP_NF_IPTABLES=m CONFIG_IP_NF_MATCH_LIMIT=m CONFIG_IP_NF_MATCH_MAC=m CONFIG_IP_NF_MATCH_PKTTYPE=m CONFIG_IP_NF_MATCH_MARK=m CONFIG_IP_NF_MATCH_MULTIPORT=m CONFIG_IP_NF_MATCH_TOS=m CONFIG_IP_NF_MATCH_ECN=m CONFIG_IP_NF_MATCH_DSCP=m CONFIG_IP_NF_MATCH_AH_ESP=m CONFIG_IP_NF_MATCH_LENGTH=m # CONFIG_IP_NF_MATCH_TTL is not set CONFIG_IP_NF_MATCH_TCPMSS=m CONFIG_IP_NF_MATCH_HELPER=m CONFIG_IP_NF_MATCH_STATE=m CONFIG_IP_NF_MATCH_CONNTRACK=m CONFIG_IP_NF_MATCH_UNCLEAN=m # CONFIG_IP_NF_MATCH_OWNER is not set CONFIG_IP_NF_FILTER=m CONFIG_IP_NF_TARGET_REJECT=m # CONFIG_IP_NF_TARGET_MIRROR is not set CONFIG_IP_NF_NAT=m CONFIG_IP_NF_NAT_NEEDED=y CONFIG_IP_NF_TARGET_MASQUERADE=m CONFIG_IP_NF_TARGET_REDIRECT=m CONFIG_IP_NF_NAT_AMANDA=m CONFIG_IP_NF_NAT_LOCAL=y # CONFIG_IP_NF_NAT_SNMP_BASIC is not set CONFIG_IP_NF_NAT_FTP=m CONFIG_IP_NF_NAT_TFTP=m CONFIG_IP_NF_MANGLE=m CONFIG_IP_NF_TARGET_TOS=m CONFIG_IP_NF_TARGET_ECN=m CONFIG_IP_NF_TARGET_DSCP=m CONFIG_IP_NF_TARGET_MARK=m CONFIG_IP_NF_TARGET_LOG=m CONFIG_IP_NF_TARGET_ULOG=m CONFIG_IP_NF_TARGET_TCPMSS=m CONFIG_IP_NF_ARPTABLES=m CONFIG_IP_NF_ARPFILTER=m # CONFIG_IP_NF_COMPAT_IPCHAINS is not set # CONFIG_IP_NF_COMPAT_IPFWADM is not set
Here's a screenshot of my modularized 2.6 Kernel config (Navigation: Device Drivers → Networking Support → Networking Options → Network Packet Filtering (replaces ipchains) → IP: Netfilter configuration):
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Here is the corresponding part of the .config file:
CONFIG_IP_NF_CONNTRACK=m CONFIG_IP_NF_FTP=m CONFIG_IP_NF_IRC=m CONFIG_IP_NF_TFTP=m CONFIG_IP_NF_AMANDA=m CONFIG_IP_NF_QUEUE=m CONFIG_IP_NF_IPTABLES=m CONFIG_IP_NF_MATCH_LIMIT=m CONFIG_IP_NF_MATCH_IPRANGE=m CONFIG_IP_NF_MATCH_MAC=m CONFIG_IP_NF_MATCH_PKTTYPE=m CONFIG_IP_NF_MATCH_MARK=m CONFIG_IP_NF_MATCH_MULTIPORT=m CONFIG_IP_NF_MATCH_TOS=m CONFIG_IP_NF_MATCH_RECENT=m CONFIG_IP_NF_MATCH_ECN=m CONFIG_IP_NF_MATCH_DSCP=m CONFIG_IP_NF_MATCH_AH_ESP=m CONFIG_IP_NF_MATCH_LENGTH=m CONFIG_IP_NF_MATCH_TTL=m CONFIG_IP_NF_MATCH_TCPMSS=m CONFIG_IP_NF_MATCH_HELPER=m CONFIG_IP_NF_MATCH_STATE=m CONFIG_IP_NF_MATCH_CONNTRACK=m CONFIG_IP_NF_MATCH_OWNER=m CONFIG_IP_NF_MATCH_PHYSDEV=m CONFIG_IP_NF_FILTER=m CONFIG_IP_NF_TARGET_REJECT=m CONFIG_IP_NF_NAT=m CONFIG_IP_NF_NAT_NEEDED=y CONFIG_IP_NF_TARGET_MASQUERADE=m CONFIG_IP_NF_TARGET_REDIRECT=m CONFIG_IP_NF_TARGET_NETMAP=m CONFIG_IP_NF_TARGET_SAME=m CONFIG_IP_NF_NAT_LOCAL=y CONFIG_IP_NF_NAT_SNMP_BASIC=m CONFIG_IP_NF_NAT_IRC=m CONFIG_IP_NF_NAT_FTP=m CONFIG_IP_NF_NAT_TFTP=m CONFIG_IP_NF_NAT_AMANDA=m CONFIG_IP_NF_MANGLE=m CONFIG_IP_NF_TARGET_TOS=m CONFIG_IP_NF_TARGET_ECN=m CONFIG_IP_NF_TARGET_DSCP=m CONFIG_IP_NF_TARGET_MARK=m CONFIG_IP_NF_TARGET_CLASSIFY=m CONFIG_IP_NF_TARGET_LOG=m CONFIG_IP_NF_TARGET_ULOG=m CONFIG_IP_NF_TARGET_TCPMSS=m # CONFIG_IP_NF_ARPTABLES is not set # CONFIG_IP_NF_COMPAT_IPCHAINS is not set # CONFIG_IP_NF_COMPAT_IPFWADM is not set # CONFIG_IP_NF_RAW is not set CONFIG_IP_NF_MATCH_ADDRTYPE=m # CONFIG_IP_NF_MATCH_REALM is not set CONFIG_IP6_NF_QUEUE=m CONFIG_IP6_NF_IPTABLES=m CONFIG_IP6_NF_MATCH_LIMIT=m CONFIG_IP6_NF_MATCH_MAC=m CONFIG_IP6_NF_MATCH_RT=m CONFIG_IP6_NF_MATCH_OPTS=m CONFIG_IP6_NF_MATCH_FRAG=m CONFIG_IP6_NF_MATCH_HL=m CONFIG_IP6_NF_MATCH_MULTIPORT=m CONFIG_IP6_NF_MATCH_OWNER=m CONFIG_IP6_NF_MATCH_MARK=m CONFIG_IP6_NF_MATCH_IPV6HEADER=m CONFIG_IP6_NF_MATCH_AHESP=m CONFIG_IP6_NF_MATCH_LENGTH=m CONFIG_IP6_NF_MATCH_EUI64=m CONFIG_IP6_NF_FILTER=m CONFIG_IP6_NF_TARGET_LOG=m CONFIG_IP6_NF_MANGLE=m CONFIG_IP6_NF_TARGET_MARK=m # CONFIG_IP6_NF_RAW is not set CONFIG_DECNET_NF_GRABULATOR=m CONFIG_BRIDGE_NF_EBTABLES=m