Help with iptables


 
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# 1  
Help with iptables

Hi, I just build a Linux server, I said yes to enable the firewall. I only choose SSH conneciton. When I check the iptables. I see all of this (see below). I want to reject every thing only allow SSH from subnet 192.168.1.xx. Can you advise, how to do.

Code:
 
 
Chain RH-Firewall-1-INPUT (2 references)
 pkts bytes target     prot opt in     out     source               destination
 1043 3332K ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0
    0     0 ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0           icmp type 255
    0     0 ACCEPT     esp  --  *      *       0.0.0.0/0            0.0.0.0/0
    0     0 ACCEPT     ah   --  *      *       0.0.0.0/0            0.0.0.0/0
   15  2978 ACCEPT     udp  --  *      *       0.0.0.0/0            224.0.0.251         udp dpt:5353
    0     0 ACCEPT     udp  --  *      *       0.0.0.0/0            0.0.0.0/0           udp dpt:631
    0     0 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:631
  540 44542 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0           state RELATED,ESTABLISHED
    3   156 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           state NEW tcp dpt:22
 1532  142K REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0           reject-with icmp-host-prohibited

# 2  
You could set the default INPUT policy to DROP:

Code:
iptables -P INPUT DROP

And add a rule to allow ssh from the desired subnet:

Code:
iptables -A INPUT -p tcp --source 192.168.1.0/24 --dport 22 -j ACCEPT

This User Gave Thanks to in2nix4life For This Post:
# 3  
Thank you for the quick reply.
 

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