Here is a help text from 2.4.21-pre4 Configure.help which is
needed in 2.5.59 net/ipv4/netfilter/Kconfig.
Steven
--- linux-2.5.59/net/ipv4/netfilter/Kconfig.orig Wed Jan 29 07:30:59 2003
+++ linux-2.5.59/net/ipv4/netfilter/Kconfig Wed Jan 29 07:32:43 2003
@@ -148,6 +148,14 @@
config IP_NF_MATCH_DSCP
tristate "DSCP match support"
depends on IP_NF_IPTABLES
+ help
+ This option adds a `DSCP' match, which allows you to match against
+ the IPv4 header DSCP field (DSCP codepoint).
+
+ The DSCP codepoint can have any value between 0x0 and 0x4f.
+
+ If you want to compile it as a module, say M here and read
+ Documentation/modules.txt. If unsure, say `N'.
config IP_NF_MATCH_AH_ESP
tristate "AH/ESP match support"