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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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LEARN ABOUT SUNOS

ip6tables-save

IPTABLES-SAVE(8)						  iptables 1.6.1						  IPTABLES-SAVE(8)

NAME

       iptables-save -- dump iptables rules to stdout

       ip6tables-save -- dump iptables rules to stdout

SYNOPSIS

       iptables-save [-M modprobe] [-c] [-t table]

       ip6tables-save [-M modprobe] [-c] [-t table]

DESCRIPTION

       iptables-save  and ip6tables-save are used to dump the contents of IP or IPv6 Table in easily parseable format to STDOUT. Use I/O-redirect-
       ion provided by your shell to write to a file.

       -M, --modprobe modprobe_program
	      Specify the path to the modprobe program. By default, iptables-save will inspect /proc/sys/kernel/modprobe  to  determine  the  exe-
	      cutable's path.

       -c, --counters
	      include the current values of all packet and byte counters in the output

       -t, --table tablename
	      restrict output to only one table. If not specified, output includes all available tables.

BUGS

       None known as of iptables-1.2.1 release

AUTHORS

       Harald Welte <laforge@gnumonks.org>
       Rusty Russell <rusty@rustcorp.com.au>
       Andras Kis-Szabo <kisza@sch.bme.hu> contributed ip6tables-save.

SEE ALSO

       iptables-apply(8),iptables-restore(8), iptables(8)

       The  iptables-HOWTO, which details more iptables usage, the NAT-HOWTO, which details NAT, and the netfilter-hacking-HOWTO which details the
       internals.

iptables 1.6.1															  IPTABLES-SAVE(8)
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