I have a Ubuntu 20.04.2 laptop that i intend to turn into a router. I have two network cards one is wireless (wl01) which is connected to Internet. I have an ethernet card (enp3s0) IP ADDRESS 192.168.0.1 to which i want to connect an Access Point that can provide connectivity to other clients.
The output of /proc/sys/net/ipv4/ip_forward is 1
I then proceeded with the following commands.
iptables -t nat -A POSTROUTING -o wl01 -j MASQUERADE
iptables -A INPUT -i enp3s0 -j ACCEPT
iptables -A INPUT -i wl01 -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A OUTPUT -j ACCEPT
However the clients aren't able to connect to the internet. They are able to ping the gateway i.e 192.168.0.1 but aren't able to connect to the internet.
What am i doing wrong here? Reading the documentation that should do it. Any suggestions.
The output of iptables dump
*mangle
:PREROUTING ACCEPT [6714:892007]
:INPUT ACCEPT [5733:771154]
:FORWARD ACCEPT [15:1140]
:OUTPUT ACCEPT [6708:636233]
:POSTROUTING ACCEPT [6729:639113]
:FORWARD_direct - [0:0]
:INPUT_direct - [0:0]
:OUTPUT_direct - [0:0]
:POSTROUTING_direct - [0:0]
:PREROUTING_ZONES - [0:0]
:PREROUTING_direct - [0:0]
:PRE_public - [0:0]
:PRE_public_allow - [0:0]
:PRE_public_deny - [0:0]
:PRE_public_log - [0:0]
:PRE_public_post - [0:0]
:PRE_public_pre - [0:0]
-A PREROUTING -j PREROUTING_direct
-A PREROUTING -j PREROUTING_ZONES
-A INPUT -j INPUT_direct
-A FORWARD -j FORWARD_direct
-A OUTPUT -j OUTPUT_direct
-A POSTROUTING -j POSTROUTING_direct
-A PREROUTING_ZONES -i wlo1 -g PRE_public
-A PREROUTING_ZONES -i enp3s0 -g PRE_public
-A PREROUTING_ZONES -g PRE_public
-A PRE_public -j PRE_public_pre
-A PRE_public -j PRE_public_log
-A PRE_public -j PRE_public_deny
-A PRE_public -j PRE_public_allow
-A PRE_public -j PRE_public_post
COMMIT
:PREROUTING ACCEPT [6714:892007]
:OUTPUT ACCEPT [6708:636233]
:OUTPUT_direct - [0:0]
:PREROUTING_ZONES - [0:0]
:PREROUTING_direct - [0:0]
:PRE_public - [0:0]
:PRE_public_allow - [0:0]
:PRE_public_deny - [0:0]
:PRE_public_log - [0:0]
:PRE_public_post - [0:0]
:PRE_public_pre - [0:0]
-A PREROUTING -j PREROUTING_direct
-A PREROUTING -j PREROUTING_ZONES
-A OUTPUT -j OUTPUT_direct
-A PREROUTING_ZONES -i wlo1 -g PRE_public
-A PREROUTING_ZONES -i enp3s0 -g PRE_public
-A PREROUTING_ZONES -g PRE_public
-A PRE_public -j PRE_public_pre
-A PRE_public -j PRE_public_log
-A PRE_public -j PRE_public_deny
-A PRE_public -j PRE_public_allow
-A PRE_public -j PRE_public_post
COMMIT
:INPUT ACCEPT [4432:629712]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [6703:635713]
:FORWARD_direct - [0:0]
:INPUT_direct - [0:0]
:OUTPUT_direct - [0:0]
-A INPUT -j INPUT_direct
-A FORWARD -j FORWARD_direct
-A OUTPUT -j OUTPUT_direct
COMMIT
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:FORWARD_IN_ZONES - [0:0]
:FORWARD_OUT_ZONES - [0:0]
:FORWARD_direct - [0:0]
:FWDI_public - [0:0]
:FWDI_public_allow - [0:0]
:FWDI_public_deny - [0:0]
:FWDI_public_log - [0:0]
:FWDI_public_post - [0:0]
:FWDI_public_pre - [0:0]
:FWDO_public - [0:0]
:FWDO_public_allow - [0:0]
:FWDO_public_deny - [0:0]
:FWDO_public_log - [0:0]
:FWDO_public_post - [0:0]
:FWDO_public_pre - [0:0]
:INPUT_ZONES - [0:0]
:INPUT_direct - [0:0]
:IN_public - [0:0]
:IN_public_allow - [0:0]
:IN_public_deny - [0:0]
:IN_public_log - [0:0]
:IN_public_post - [0:0]
:IN_public_pre - [0:0]
:OUTPUT_direct - [0:0]
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED,DNAT -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -j INPUT_direct
-A INPUT -j INPUT_ZONES
-A INPUT -m conntrack --ctstate INVALID -j DROP
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A INPUT -i enp3s0 -j ACCEPT
-A INPUT -i wl01 -m state --state RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED,DNAT -j ACCEPT
-A FORWARD -i lo -j ACCEPT
-A FORWARD -j FORWARD_direct
-A FORWARD -j FORWARD_IN_ZONES
-A FORWARD -j FORWARD_OUT_ZONES
-A FORWARD -m conntrack --ctstate INVALID -j DROP
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
-A OUTPUT -o lo -j ACCEPT
-A OUTPUT -j OUTPUT_direct
-A OUTPUT -j ACCEPT
-A FORWARD_IN_ZONES -i wlo1 -g FWDI_public
-A FORWARD_IN_ZONES -i enp3s0 -g FWDI_public
-A FORWARD_IN_ZONES -g FWDI_public
-A FORWARD_OUT_ZONES -o wlo1 -g FWDO_public
-A FORWARD_OUT_ZONES -o enp3s0 -g FWDO_public
-A FORWARD_OUT_ZONES -g FWDO_public
-A FWDI_public -j FWDI_public_pre
-A FWDI_public -j FWDI_public_log
-A FWDI_public -j FWDI_public_deny
-A FWDI_public -j FWDI_public_allow
-A FWDI_public -j FWDI_public_post
-A FWDI_public -p icmp -j ACCEPT
-A FWDO_public -j FWDO_public_pre
-A FWDO_public -j FWDO_public_log
-A FWDO_public -j FWDO_public_deny
-A FWDO_public -j FWDO_public_allow
-A FWDO_public -j FWDO_public_post
-A INPUT_ZONES -i wlo1 -g IN_public
-A INPUT_ZONES -i enp3s0 -g IN_public
-A INPUT_ZONES -g IN_public
-A IN_public -j IN_public_pre
-A IN_public -j IN_public_log
-A IN_public -j IN_public_deny
-A IN_public -j IN_public_allow
-A IN_public -j IN_public_post
-A IN_public -p icmp -j ACCEPT
-A IN_public_allow -p tcp -m tcp --dport 22 -m conntrack --ctstate
NEW,UNTRACKED -j ACCEPT
COMMIT
:PREROUTING ACCEPT [1729:198863]
:INPUT ACCEPT [1:60]
:OUTPUT ACCEPT [1927:151765]
:POSTROUTING ACCEPT [1927:151765]
:OUTPUT_direct - [0:0]
:POSTROUTING_ZONES - [0:0]
:POSTROUTING_direct - [0:0]
:POST_public - [0:0]
:POST_public_allow - [0:0]
:POST_public_deny - [0:0]
:POST_public_log - [0:0]
:POST_public_post - [0:0]
:POST_public_pre - [0:0]
:PREROUTING_ZONES - [0:0]
:PREROUTING_direct - [0:0]
:PRE_public - [0:0]
:PRE_public_allow - [0:0]
:PRE_public_deny - [0:0]
:PRE_public_log - [0:0]
:PRE_public_post - [0:0]
:PRE_public_pre - [0:0]
-A PREROUTING -j PREROUTING_direct
-A PREROUTING -j PREROUTING_ZONES
-A OUTPUT -j OUTPUT_direct
-A POSTROUTING -j POSTROUTING_direct
-A POSTROUTING -j POSTROUTING_ZONES
-A POSTROUTING -o wl01 -j MASQUERADE
-A POSTROUTING_ZONES -o wlo1 -g POST_public
-A POSTROUTING_ZONES -o enp3s0 -g POST_public
-A POSTROUTING_ZONES -g POST_public
-A POST_public -j POST_public_pre
-A POST_public -j POST_public_log
-A POST_public -j POST_public_deny
-A POST_public -j POST_public_allow
-A POST_public -j POST_public_post
-A PREROUTING_ZONES -i wlo1 -g PRE_public
-A PREROUTING_ZONES -i enp3s0 -g PRE_public
-A PREROUTING_ZONES -g PRE_public
-A PRE_public -j PRE_public_pre
-A PRE_public -j PRE_public_log
-A PRE_public -j PRE_public_deny
-A PRE_public -j PRE_public_allow
-A PRE_public -j PRE_public_post
COMMIT
