You can see that your default policy is ACCEPT, so your rule:

> iptables -A FORWARD -p icmp  -m limit --limit 1/m -j ACCEPT

will accept the packets in the limit, and if it is out of the limit
the packet is accepted
by the default policy.

> Chain FORWARD (policy ACCEPT)

Instead you can do:
iptables -A FORWARD -p icmp  -m limit --limit 1/m -j ACCEPT
iptables -A FORWARD -p icmp  -j DROP

Note that ping is not the only icmp packet which exists, so you might
find it useful
to add "--icmp-type echo-request" to both lines.

best of luck
G.

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