RE: Cisco Workaround (comment on actually using those protocols)

[jamesworld () intelligencia com]

Then you would be having traffic of that type allowed in from untrusted 
sources.  Your ACL's would be formed to only allow the explicit traffic 
from those explicit hosts.  And rarely, would you have the traffic 
terminating on the interface or the IP address of the router, it'd be 
passed/routed along to the appropriate host(s).  In those RARE exceptions 
where you would need to terminate them on the IP or interface of the 
router, again you would allow only trusted traffic using those protocols to 
terminate there.

And as far as the 'workaround' goes, it's fine  you need to adjust it for 
your environment if you use those protocols of course.
As far as the 'solution' goes, the solution is 100%, upgrade to the 
appropriate  patched version.

FUD



At 10:33 7/25/2003, Ghaith Nasrawi wrote:
> Well, my question is; what the hell if I was using any of these
> protocols?? Didn't cisco think of that?? They should have suggested a
> more decent solution.
>
>
> ./Ghaith
> ===============
>
> Today is the tomorrow you worried about yesterday
>
>
>
>
>
> -----Original Message-----
> From: jamesworld () intelligencia com [mailto:jamesworld () intelligencia com]
>
> Sent: Wednesday, July 23, 2003 6:48 PM
> To: Alvaro Gordon-Escobar
> Cc: firewalls () securityfocus com; security-basics () securityfocus com
> Subject: Re: Cisco Workaround
>
> Alvaro,
>
> No.  The protocol blocked by the access-list is protocol 53 not protocol
>
> TCP or protocol UDP port 53.
>
> If you need further info, let me know,
>
> -James
>
>
>
> At 09:15 7/23/2003, Alvaro Gordon-Escobar wrote:
> >will this access list modification prevent my internal DNS server from
> >updates to it self from my telco's DNS server?
> >
> >access-list 101 deny 53 any any
> >access-list 101 deny 55 any any
> >access-list 101 deny 77 any any
> >access-list 101 deny 103 any any
> >!--- insert any other previously applied ACL entries here
> >!--- you must permit other protocols through to allow normal
> >!--- traffic -- previously defined permit lists will work
> >!--- or you may use the permit ip any any shown here
> >access-list 101 permit ip any any
> >
> >Thanks in advance
> >
> >~alvaro Escobar
> >
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