it mentioned here:
3. Block incoming ICMP messages and any other incoming traffic with iptables or any of its frontends, such as ufw.
Well thats wrong check:
https://help.ubuntu.com/community/UFW#Allow_Access
By default, UFW allows ping requests . You may find you wish to leave (icmp) ping requests enabled to diagnose networking problems.
its better to block icmp on GNU using iptables rules not ufw.
81a989
2
Your link shows that UFW permits ping requests but not timestamp requests.
Interesting ICMP types
0 Echo reply
8 Echo request (ping)
13 Timestamp request
14 Timestamp reply
17 Address mask request
18 Address mask reply
http://www.dds6qkxpwdeubwucdiaord2xgbbeyds25rbsgr73tbfpqpt4a6vjwsyd.onion/wiki/Disable_TCP_and_ICMP_Timestamps#cite_note-12
1 Like
i see , mentioned somewhere else in the wiki.
anyway this can replace ufw stuff.