basic pix   7.0(1) icmp question

basic pix 7.0(1) icmp question

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Subject Author Date
basic pix 7.0(1) icmp question mak 07-18-2007
Posted by mak on July 18, 2007, 3:09 am
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this should not be a challange...

i want to deny icmp to the outside interface:

access-list acl_outside; 4 elements
access-list acl_outside line 1 extended permit tcp any host 1.2.3.4 eq ftp
(hitcnt=3531)
access-list acl_outside line 2 extended permit tcp any host 1.2.3.4 eq www
(hitcnt=36336)
access-list acl_outside line 3 extended permit tcp any host 1.2.3.4 eq 81
(hitcnt=2130)
access-list acl_outside line 4 extended deny icmp any interface outside
(hitcnt=0)

my ping to the outside interface is still being answered...
what's going on?

PS:
I would like to allow ping to inside host, and would add:

access-list acl_outside extended permit icmp any host 1.2.3.4

correct?

Posted by mak on July 18, 2007, 6:15 am
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mak wrote:
> this should not be a challange...
>
> i want to deny icmp to the outside interface:
>
> access-list acl_outside; 4 elements
> access-list acl_outside line 1 extended permit tcp any host 1.2.3.4 eq
> ftp (hitcnt=3531)
> access-list acl_outside line 2 extended permit tcp any host 1.2.3.4 eq
> www (hitcnt=36336)
> access-list acl_outside line 3 extended permit tcp any host 1.2.3.4 eq
> 81 (hitcnt=2130)
> access-list acl_outside line 4 extended deny icmp any interface outside
> (hitcnt=0)
>
> my ping to the outside interface is still being answered...
> what's going on?
>
> PS:
> I would like to allow ping to inside host, and would add:
>
> access-list acl_outside extended permit icmp any host 1.2.3.4
>
> correct?


found the problem:
icmp deny any outside

Posted by Jens Hoffmann on July 18, 2007, 12:24 pm
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> found the problem:
> icmp deny any outside

Doesn't this forbid any icmp message?

like: "FRAGMENTATION_NEEDED_BUT_DF_SET", "Source_QUENCH" (ok, very
seldom these days), "TIME_EXCEEDED", "PARAMETER PROBLEM", "DESTINATION
UNREACHABLE".

But you are probably sure, that you want to do a blind network flight.

Cheers,
Jens

Posted by mak on July 19, 2007, 1:49 am
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Jens Hoffmann wrote:
>> found the problem:
>> icmp deny any outside
>
> Doesn't this forbid any icmp message?
>
> like: "FRAGMENTATION_NEEDED_BUT_DF_SET", "Source_QUENCH" (ok, very
> seldom these days), "TIME_EXCEEDED", "PARAMETER PROBLEM", "DESTINATION
> UNREACHABLE".
>
> But you are probably sure, that you want to do a blind network flight.
>
> Cheers,
> Jens
yes it does, but customer wants it that way ...

Posted by Jens Hoffmann on July 19, 2007, 12:18 pm
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> yes it does, but customer wants it that way ...

Make sure to have a small note signed, that he is aware
of the fact, that he will have problems in the future.

Cheers,
Jens

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