I understand your point, Bruno, but the inspection only occurs on the traffic
matched in your ACL. If you have an ACL matching telnet, and your class-map
matches this ACL, inspection will only occur for TCP/23. I believe that ZFW
will identify that traffic as telnet (since it is coming across TCP/23) and
will inspect it as such.
From: Bruno [mailto:[email protected]]
Sent: Tuesday, May 17, 2011 7:47 AM
To: Nick Montante
Cc: Kingsley Charles; Kok Yong CHEONG; [email protected]
Subject: Re: [OSL | CCIE_Security] Doubts on Zone based firewall
Well, If I read "all protocols will be inspected" only wanting to have like
telnet specifically, I would say that it is for sure something I do not want
I would still go with match protocol xxxx as required.
On Tue, May 17, 2011 at 8:38 AM, Nick Montante
<[email protected]<mailto:[email protected]>> wrote:
My understanding is that a “match protocol” statement is not required; however,
if you do not match any traffic using NBAR and you only match it in your ACL,
it will still work as expected but it will throw a warning when configured (and
at boot) that “no protocol was specified, so all protocols will be inspected”.
From:
[email protected]<mailto:[email protected]>
[mailto:[email protected]<mailto:[email protected]>]
On Behalf Of Kingsley Charles
Sent: Tuesday, May 17, 2011 7:11 AM
To: Bruno
Cc: Kok Yong CHEONG;
[email protected]<mailto:[email protected]>
Subject: Re: [OSL | CCIE_Security] Doubts on Zone based firewall
I don't think so. All the above given config should work. "match protocol" is
not mandatory for a class-map.
With regards
Kings
On Tue, May 17, 2011 at 3:30 PM, Bruno
<[email protected]<mailto:[email protected]>> wrote:
Keep in mind that ZBF requires at least one match protocol statement on
class-maps.
With that said, some options you said will not work
On Tue, May 17, 2011 at 4:40 AM, Kingsley Charles
<[email protected]<mailto:[email protected]>> wrote:
If you are matching the protocol in the access-list, then you need not specify
"match protocol xxx".
With regards
Kings
On Tue, May 17, 2011 at 1:02 PM, Kok Yong CHEONG
<[email protected]<mailto:[email protected]>> wrote:
hi Thank for your input,
for example of smtp, based on your explanation, there isn't need to "match
protocol smtp " then ? since the access-list already mentioned the port 25
which also means matching smtp protocol from the access-list ?
my main doubt was that do i need to specify "match protocol xxx" since i've
already kind of mention it in the ACL with "access-list 122 permit tcp any host
192.1.1.200 eq 25"
thanks in advance
regards
KY
On Tue, May 17, 2011 at 2:35 PM, Kingsley Charles
<[email protected]<mailto:[email protected]>> wrote:
Option A is simple and will work.
Option B can be configured as following in either of two ways:
access-list 121 permit ip any host 192.1.1.100
access-list 122 permit ip any host 192.1.1.200
class-map type inspect match-all CM-I-D-SMTP
match access-group 122
match protocol smtp
class-map type inspect match-all CM-I-D-WEB
match access-group 121
match protocol http
policy-map type inspect PM-I-D
class type inspect CM-I-D-WEB
inspect
class type inspect CM-I-D-SMTP
inspect
or
access-list 121 permit tcp any host 192.1.1.100 eq 80
access-list 122 permit tcp any host 192.1.1.200 eq 25
class-map type inspect match-all CM-I-D-SMTP
match access-group 122
class-map type inspect match-all CM-I-D-WEB
match access-group 121
policy-map type inspect PM-I-D
class type inspect CM-I-D-WEB
inspect
class type inspect CM-I-D-SMTP
inspect
With regards
Kings
On Tue, May 17, 2011 at 11:33 AM, Kok Yong CHEONG
<[email protected]<mailto:[email protected]>> wrote:
hi Guys
I'd like to clear by doubts on ZBF.
a practice question like: configure zone policy coming in from internet to DMZ
as follows:
1) allow web access to a server 192.1.1.100 located on the DMZ zone
2) allows smtp access to server 192.1.1.200 located in DMZ zone
will the config be (a) or (b) :
(a) access-list 124 permit tcp any host 192.1.1.100 eq 80
access-list 124 permit tcp any host 192.1.1.200 eq 25
class-map type inspect C-I-D
match access-group 124
policy-map type inspect P-I-D
class type C-I-D
inspect
OR
----------------------------------------------------------------------------------------------------------
(b)
access-list 121 permit tcp any host 192.1.1.100 eq 80
access-list 122 permit tcp any host 192.1.1.200 eq 25
class-map type inspect match-all CM-I-D-SMTP
match access-group 122
match protocol smtp ------> why do we still need to mention SMTP ?
class-map type inspect match-all CM-I-D-WEB
match access-group 121
match protocol http ------> why do we still need to mention http ?
policy-map type inspect PM-I-D
class type inspect CM-I-D-WEB
inspect
class type inspect CM-I-D-SMTP
inspect
----------------------------------------------------------------------------------------------------------
my main doubt for (b) is why do we need "match protocol smtp", since it never
mentioned layer 7 inspection. I would expect the access-list is sufficient to
define the traffic as http traffic already ? or we need both the acl and
protocol to make it complete ?
appreciate your effort to enlighten me.. thanks in advance
regards
KY
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Bruno Fagioli (by Jaunty Jackalope)
Cisco Security Professional
This communication is the property of ClarkDietrich Building Systems LLC and may
contain confidential or privileged information. Unauthorized use of this
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this communication in error, please immediately notify the sender by reply and
destroy all copies of the communication and any attachments.
--
Bruno Fagioli (by Jaunty Jackalope)
Cisco Security Professional
This communication is the property of ClarkDietrich Building Systems LLC and may
contain confidential or privileged information. Unauthorized use of this
communication is strictly prohibited and may be unlawful. If you have received
this communication in error, please immediately notify the sender by reply and
destroy all copies of the communication and any attachments.
_______________________________________________
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