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Full Discussion: iptables help with rules
Top Forums UNIX for Advanced & Expert Users iptables help with rules Post 302988736 by steadyonabix on Sunday 1st of January 2017 11:52:11 AM
Old 01-01-2017
This works but...

I've tried

Code:
iptables -A INPUT  -p tcp  --dport 22  -j ACCEPT
iptables -A OUTPUT -p tcp  --sport 22  -j ACCEPT

But that makes no difference. It seems to be the port that is causing the issue as this works fine:

Code:
iptables -A INPUT  -p tcp  -j ACCEPT
iptables -A OUTPUT -p tcp  -j ACCEPT


Combined, these allow me to log in via the wlan0 interface and go onto the inner pi's via eth0:

Code:
# Allow ssh
iptables -A OUTPUT -p tcp --sport 22 -m conntrack --ctstate NEW,RELATED,ESTABLISHED -j ACCEPT
iptables -A INPUT  -p tcp  --dport 22 -m conntrack --ctstate NEW,RELATED,ESTABLISHED -j ACCEPT
iptables -A INPUT -i eth0 -p tcp  -j ACCEPT
iptables -A OUTPUT -o eth0 -p tcp  -j ACCEPT

But I can't define port 22 on the eth0 interface without it failing... Weird! I wonder if it could be related to my interfaces file:

Code:
root@fwl:~# cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)

# Please note that this file is written to be used with dhcpcd
# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'

# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

auto lo
iface lo inet loopback
auto eth0

iface eth0 inet static
    address 10.10.1.1
    netmask 255.255.255.0
    network 10.10.1.0

allow-hotplug wlan0
iface wlan0 inet dhcp
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

 

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IPTABLES-XML(8) 														   IPTABLES-XML(8)

NAME
iptables-xml -- Convert iptables-save format to XML SYNOPSIS
iptables-xml [-c] [-v] DESCRIPTION
iptables-xml is used to convert the output of iptables-save into an easily manipulatable XML format to STDOUT. Use I/O-redirection pro- vided by your shell to write to a file. -c, --combine combine consecutive rules with the same matches but different targets. iptables does not currently support more than one target per match, so this simulates that by collecting the targets from consecutive iptables rules into one action tag, but only when the rule matches are identical. Terminating actions like RETURN, DROP, ACCEPT and QUEUE are not combined with subsequent targets. -v, --verbose Output xml comments containing the iptables line from which the XML is derived iptables-xml does a mechanistic conversion to a very expressive xml format; the only semantic considerations are for -g and -j targets in order to discriminate between <call> <goto> and <nane-of-target> as it helps xml processing scripts if they can tell the difference between a target like SNAT and another chain. Some sample output is: <iptables-rules> <table name="mangle"> <chain name="PREROUTING" policy="ACCEPT" packet-count="63436" byte-count="7137573"> <rule> <conditions> <match> <p>tcp</p> </match> <tcp> <sport>8443</sport> </tcp> </conditions> <actions> <call> <check_ip/> </call> <ACCEPT/> </actions> </rule> </chain> </table> </iptables-rules> Conversion from XML to iptables-save format may be done using the iptables.xslt script and xsltproc, or a custom program using libxsltproc or similar; in this fashion: xsltproc iptables.xslt my-iptables.xml | iptables-restore BUGS
None known as of iptables-1.3.7 release AUTHOR
Sam Liddicott <azez@ufomechanic.net> SEE ALSO
iptables-save(8), iptables-restore(8), iptables(8) Jul 16, 2007 IPTABLES-XML(8)
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