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Hello, i read this: Code: # Ignore all ICMP ECHO and TIMESTAMP requests sent to it via broadcast/multicast net.ipv4.icmp_echo_ignore_broadcasts = 1 and i checked my sysctl like this: Code: # ...
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- 04-09-2014 #1
net.ipv4.icmp_echo_ignore_broadcasts = 1 - but ping works?
# Ignore all ICMP ECHO and TIMESTAMP requests sent to it via broadcast/multicast net.ipv4.icmp_echo_ignore_broadcasts = 1
# sysctl -a | grep net.ipv4.icmp_echo net.ipv4.icmp_echo_ignore_broadcasts = 1 net.ipv4.icmp_echo_ignore_all = 0
But why then i can ping to my server from external server and get response? What this value actually do?"Avoid the Gates of Hell. Use Linux affordable VPS."
- 04-10-2014 #2
- Join Date
- Jun 2012
- SF Bay area
The answer is in the comment in the first code block you posted. That settings only controls how the system deals with "broadcast/multicast" packets. ICMP packet that are unicast, meaning sent to one specific server, are outside the scope of the rule.