block outgoing icmp linux mail forwarding

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block outgoing icmp linux mail forwarding

Post by jamied_uk on 15th January 2012, 18:14

this is to stop spam coming from linux box

Instruction from above site:

Disable ICMP Redirects:
In most of the Linux flavors (Debian, Ubuntu, Redhat Enterprise linux, OpenSuSe) ICMP Redirects can be dynamically disabled on the host by adding the proper entries in the /etc/sysctl.conf configuration file. Simply edit the /etc/sysctl.conf file and add the following entries:

For IPv4

net.ipv4.conf.all.accept_redirects = 1
net.ipv4.conf.all.send_redirects = 1

For Ipv6

net.ipv6.conf.all.accept_redirects = 1
net.ipv6.conf.all.send_redirects = 1

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