ubuntu - UFW: Allow ping requests only for specific host -

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i setuping server , must disable ping requests except me , list of hosts (aaa.bbb.ccc.ddd).

i using tool ufw, on ubuntu server, read have comment lines:

ok icmp codes

-a ufw-before-input -p icmp --icmp-type destination-unreachable -j accept -a ufw-before-input -p icmp --icmp-type source-quench -j accept -a ufw-before-input -p icmp --icmp-type time-exceeded -j accept -a ufw-before-input -p icmp --icmp-type parameter-problem -j accept -a ufw-before-input -p icmp --icmp-type echo-request -j accept,

however, doing disallow ping, problem because need "aaa.bbb.ccc.ddd" have response ping requests.

can me write correct command?

thank lot in advance.

i stumbled on 4 month old question. should listed on different stackexchange (such serverfault), developer needs configure firewall. is, i'm here answer you.

for firewall rules, you'll want accept packets safe ips first , drop rest. here's how did it:

let's assume want accept 1 safe ip pings , ip address '127.0.0.1'. of course, ip address want (just create more rules or define subnets additional addresses).

step 1

first thing check following in /etc/ufw/sysctl.conf

net/ipv4/icmp_echo_ignore_all=1

...should rewritten 0 if not already...

net/ipv4/icmp_echo_ignore_all=0

step 2

add rules ipv4 /etc/ufw/before.rules

-a ufw-before-input -p icmp --icmp-type echo-request –s 127.0.0.1 -m state --state established -j accept

step 3 (for ipv6 support)

add rules ipv6 /etc/ufw/before6.rules

-a ufw6-before-input -p icmpv6 --icmpv6-type echo-request –s 127.0.0.1 -m state --state established -j accept

step 4

now, restart firewall , drink beverage of choice.

service ufw restart

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