Le 10/12/2014 19:22, Pablo Neira Ayuso a écrit :
On Wed, Dec 10, 2014 at 03:39:04PM +0100, leroy christophe wrote:
Hi,
I'm trying to redirect incoming tcp connections for port 222 to
local port 22 (because I will dnat incoming connections for port 22
to another destination).
Then you have to use "redirect" instead of "dnat". "redirect" will be
available since the upcoming 3.19-rc.
Cc'ing Arturo, he has worked on the redirect support.
@Arturo: Could you add documentation for your 'redirect' support to ?
http://wiki.nftables.org/wiki-nftables/index.php/Performing_Network_Address_Translation_%28NAT%29
Thanks.
Thanks for the information.
I have now applied patches 8d13edd, 9de920e and e9105f1 on my 3.18
kernel, so now the redirect rule is accepted, but I still get the same
issue: dport gets value 0 instead of 22 after the redirect, see below
Is there any other patch to apply ?
Christophe
[ 932.304106] redir IN=eth0 OUT=
MAC=08:00:51:20:44:5b:08:00:27:fe:42:1e:08:00 SRC=172.25.231.37
DST=172.25.231.5 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=22863 DF PROTO=TCP
SPT=55116 DPT=222 WINDOW=14600 RES=0x00 SYN URGP=0
[ 932.304523] rejected IN=eth0 OUT=
MAC=08:00:51:20:44:5b:08:00:27:fe:42:1e:08:00 SRC=172.25.231.37
DST=172.25.231.5 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=22863 DF PROTO=TCP
SPT=55116 DPT=0 WINDOW=14600 RES=0x00 SYN URGP=0
# nft list ruleset -nn
table ip filter {
chain input {
type filter hook input priority 0;
oifname "lo" accept
ct state established,related accept
ct state new tcp dport 22 log prefix "ssh " accept
ip protocol icmp accept
udp dport { 631, 137, 68, 67, 1534, 17500, 138} drop
log prefix "rejected " reject with icmp type
host-prohibited
}
}
table ip nat {
chain prerouting {
type nat hook prerouting priority 0;
tcp dport 222 counter packets 1 bytes 60 log prefix
"redir " redirect :22
}
chain postrouting {
type nat hook postrouting priority 0;
ip saddr 192.168.0.3 oif eth1 masquerade
}
}
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