Aye, this is true. There are many dangers in ICMP from Denial of Service
attacks to maliscous backdoors (imagine the backdoor working on ICMP
like a normal shell or worse - logic bombs, redirectors, anything). In
my experience most firewalls block ICMP.
Cheers
Sujeet Nayak wrote:
>
> Hi,
> I see that most of the firewalls pass ICMP messages without filtering. Some
> of them offer filtering option only for the PING message. Does anybody know
> the firewalls that deny ICMP messages? Btw, is there any harm if I buy a
> firewall that allows all the ICMP packets to go through into and out of the
> private network.
>
> Thanks
>
> Sujeet
>
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