Re: cant ping fw

["Jörg Harmuth" <harmuth@mnemon.de>]

Brent Clark schrieb:
> Hi list
> 
> I soo close to pulling my hair out on this
> 
> I have a webserver with the following ruleset (default policy of drop)
> 
> $IPT -t filter -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
> $IPT -t filter -A INPUT -m state --state INVALID -j LOG --log-prefix
> "INVALID input: " --log-tcp-options --log-ip-options
> $IPT -t filter -A INPUT -m state --state INVALID -j DROP
> $IPT -t filter -A INPUT -d 217.199.186.255 -j DROP
> $IPT -t filter -A INPUT -p tcp --dport 80 -m state --state NEW -j ACCEPT
> $IPT -t filter -A INPUT -p tcp --dport 20 -m state --state NEW -j ACCEPT
> $IPT -t filter -A INPUT -p tcp --dport 21 -m state --state NEW -j ACCEPT
> $IPT -t filter -A INPUT -p tcp --dport 25 -m state --state NEW -j ACCEPT
> #$IPT -t filter -A INPUT -p tcp --dport 22 -m state --state NEW -j ACCEPT
> $IPT -N SSH_Brute_Force
> $IPT -A INPUT -p tcp --dport 22 -m state --state NEW -m recent --name
> SSH --set --rsource -j SSH_Brute_Force
> $IPT -A SSH_Brute_Force -s 196.36.10.114 -j ACCEPT
> $IPT -A SSH_Brute_Force -m recent ! --rcheck --seconds 60 --hitcount 3
> --name SSH --rsource -j ACCEPT
> $IPT -A SSH_Brute_Force -j LOG --log-prefix "SSH Brute Force Attempt:  "
> $IPT -A SSH_Brute_Force -p tcp -j DROP
> 
> $IPT -t filter -A INPUT -p tcp --dport 10000 -m state --state NEW -j ACCEPT
> $IPT -t filter -A INPUT -p tcp --dport 113 -j REJECT --reject-with
> icmp-host-unreachable
> $IPT -t filter -A INPUT -p tcp -m multiport --dport 135,137,139 -j DROP
> $IPT -t filter -A INPUT -p icmp --icmp-type source-quench -j ACCEPT
> $IPT -t filter -A INPUT -p icmp --icmp-type parameter-problem -j ACCEPT
> $IPT -t filter -A INPUT -p icmp --icmp-type destination-unreachable -j
> ACCEPT
> $IPT -t filter -A INPUT -p icmp --icmp-type time-exceeded -j ACCEPT
> $IPT -t filter -A INPUT -p icmp --icmp-type echo-request -j ACCEPT
> #$IPT -t filter -A INPUT -p icmp --icmp-type ! echo-request -j LOG
> $IPT -t filter -A INPUT -j LOG --log-prefix "[INPUT  DROP]: "
> --log-tcp-options --log-ip-options
> $IPT -t filter -A INPUT -j DROP
> 
> and for the likes on my I cant work out why I cant ping the machine
> even localhost, does not return anything

Is this really the complete rule set ? No rules in OUTPUT and FORWARD,
but policy set to DROP ? Anyway.

There is no rule for lo. Add

$IPT -<I | A> INPUT -i lo -j ACCEPT
$IPT -<I | A> OUTPUT -o lo -j ACCEPT

and for echo reply add

$IPT -A OUTPUT -p icmp --icmp-type echo-reply -j ACCEPT

This should work.

Have a nice time,

Joerg