ICMP redirects

Hi, I want my machine to ignore ICMP redirects in Debian Wheezy (Linux 
kernel)

Does

net.ipv4.conf.all.accept_redirects = 0

in /etc/sysctl.conf make kernel to ignore ICMP redirects for all interfaces

or

1) do I have to set it for particular interface like 
net.ipv4.conf.eth0.accept_redirects = 0

or

2) do I have to set a rule in iptables like

iptables -A INPUT -i eth0 -p icmp --icmp-type 5 -j DROP

Thanks in advance.

Best regards
Georgi