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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 DEBIAN

essidscan

ESSIDSCAN(8)							     Commands							      ESSIDSCAN(8)

NAME

       essidscan - scan for ESSID corresponding to available WLAN access points

SYNOPSIS

       In /etc/network/interfaces:

       mapping <interface> script essidscan

DESCRIPTION

       The essidscan utility is used to tell the ifup and ifdown utilities about the current SSID of the WLAN currently being accessed.  It can be
       used to map the SSID name to an iface stanza.

CONFIGURATION

       A sample /etc/network/interfaces may look like this:

	  mapping hotplug
	    script /etc/network/essidscan
	    map SSIDONE  wlan-work
	    map SSIDTWO  wlan-work
	    map HOME

	  iface wlan-work inet dhcp
	    wireless-key     1234-5678-9ABC-DEF0-1234-5678-9A
	    wireless-keymode restricted

	  iface HOME inet static
	    address	     192.168.2.4
	    netmask	     255.255.255.0
	    gateway	     192.168.2.1
	    wireless-essid   HOME
	    wireless-key     s:somepassword
	    wireless-keymode open

	  iface DEFAULT inet dhcp

FILES

       /etc/network/interfaces
	      the interfaces definition file

       /etc/network/run/ifstate
	      a record of the current state of the interfaces, managed by ifup and ifdown

SEE ALSO

       interfaces(5) ifscheme(8) ifup(8) ifdown(8)

AUTHORS

       Tor Slettnes <tor@slett.net>

																      ESSIDSCAN(8)
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