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[SOLVED] iptables command won't forward a port
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johnklug
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Joined: 17 Jun 2013
Posts: 31

PostPosted: Mon May 02, 2016 1:42 am    Post subject: [SOLVED] iptables command won't forward a port Reply with quote

I am trying to redirect TCP 443 to 8443.


    strace -f -o /tmp/trace.txt iptables -t nat -A PREROUTING -p tcp --dport 443 -j REDIRECT --to-port 8443
    iptables: No chain/target/match by that name.

    22056 socket(PF_INET, SOCK_RAW, IPPROTO_RAW) = 4
    22056 fcntl(4, F_SETFD, FD_CLOEXEC) = 0
    22056 getsockopt(4, SOL_IP, 0x40 /* IP_??? */, "nat\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., [84]) = 0
    22056 getsockopt(4, SOL_IP, 0x41 /* IP_??? */, "nat\0H\177\0\0X\\\257FH\177\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., [824]) = 0
    22056 setsockopt(4, SOL_IP, 0x40 /* IP_??? */, "nat\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1096) = -1 ENOENT (No such file or directory)
    22056 close(4) = 0
    22056 write(2, "iptables: No chain/target/match "..., 46) = 46


So is there something I have to do to create the NAT table?


    # zgrep -E '^[^#]' config-3.17.7-gentoo | grep NF_CONN
    CONFIG_NF_CONNTRACK=y
    CONFIG_NF_CONNTRACK_SECMARK=y
    CONFIG_NF_CONNTRACK_PROCFS=y
    CONFIG_NF_CONNTRACK_FTP=y
    CONFIG_NF_CONNTRACK_IRC=y
    CONFIG_NF_CONNTRACK_SIP=y
    CONFIG_NF_CONNTRACK_IPV4=y
    CONFIG_NF_CONNTRACK_PROC_COMPAT=y
    CONFIG_NF_CONNTRACK_IPV6=y


Last edited by johnklug on Sat May 14, 2016 9:11 pm; edited 1 time in total
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Syl20
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Joined: 04 Aug 2005
Posts: 547
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PostPosted: Mon May 02, 2016 8:45 am    Post subject: Reply with quote

Did you enable the REDIRECT target when compiling your kernel ? Is the module (if compiled it as a module) loaded ?
http://cateee.net/lkddb/web-lkddb/IP_NF_TARGET_REDIRECT.html
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johnklug
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Joined: 17 Jun 2013
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PostPosted: Sat May 14, 2016 9:09 pm    Post subject: Reply with quote

I added the following two kernel configuration tags, and port redirection worked:
    CONFIG_NETFILTER_XT_TARGET_REDIRECT=m
    CONFIG_IP_NF_TARGET_REDIRECT=m


Not sure if both are needed.


The doc from http://cateee.net/lkddb/web-lkddb/IP_NF_TARGET_REDIRECT.html says
    This is a backwards-compat option for the user's convenience (e.g. when running oldconfig). It selects NETFILTER_XT_TARGET_REDIRECT.


It may be that only CONFIG_NETFILTER_XT_TARGET_REDIRECT=m is needed.
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