Feb 29, 2016
Jul 02, 2012 How to enable and disable PING ICMP in Windows 10 Firewall Oct 13, 2019 ICMP Redirection Messages - Page 2 - Linksys Community A home router can also send ICMP redirects if it receives a packet which was incorrectly routed, i.e. if the in and out interface for the routed packet is the same interface. That's absolutely legitimate. And absolutely no problem. If all routes are set up correctly a router would never send an ICMP redirect. For a basic home setup that's the case. IcmpRedirectsEnabled | Microsoft® Docs Specifies that the IPv4 and IPv6 path caches are updated in response to ICMP redirect messages. This is the default value for both the IPv4 and IPv6 settings. false. Specifies that the IPv4 and IPv6 path caches are not updated in response to ICMP redirect messages.
How to Disable ICMP Redirects in Linux for security
The "no ip redirects" Command - Cisco Community no ip redirects--this disables icmp redirect messages. Redirects happen when a router recognizes a packet arriving on an interface and the best route is out that same interface. In that case the router sends an icmp redirect back to the source telling them about a better router on the same subnet. Subsequent packets take the optimal path.
ICMP redirects are sent to define a better route/gateway to a destination. As you have to have an IP address in the same network as the gateway/exit for a route, the route will only be inserted in the routing table if all the following conditions are true: accept_redirects is set to 1
ARP and ICMP redirection games - Insecure.Org ICMP redirects present a rather potent DoS. host routes won't expire with time. And of course no access to local network is required, attack can be launched from anywhere. So if the target system does accept ICMP redirects (and packets can actually reach it) that The "no ip redirects" Command - Cisco Community no ip redirects--this disables icmp redirect messages. Redirects happen when a router recognizes a packet arriving on an interface and the best route is out that same interface. In that case the router sends an icmp redirect back to the source telling them about a better router on the same subnet. Subsequent packets take the optimal path.