If you were Registered and logged in, you could reply and use other advanced thread options
|
Posted by tg on October 9, 2008, 5:59 pm
Cisco router 2651XM with wic-adsl card (Dialer0)
IOS = c2600-adventerprisek9-mz.124-2.T.bin
I'm given to understand it is possible to filter traffic based on mac
address. I've been trawling google but I can't find the syntax I'm
looking for. At the moment all my router traffic on port 25 is
unfiltered.
My router socket f0/1 ip is set at 192.168.1.100 and the router is
currently configured to forward all port 25 (smtp) traffic through f0/1
to my computer set at 192.168.1.101 thus:
ip nat inside source static tcp 192.168.1.101 25 interface Dialer0 25
(pretty straightforward)
and the firewall is set to allow smtp traffic through with:
access-list 105 permit tcp any any eq smtp
But I'd like to filter the port 25 (smtp) traffic by permitting only mac
addresses I specify. All other traffic is to be unaffected. The mac
address permission is to only apply to port 25 (smtp) traffic.
is this possible? any cli examples satisfying the above would be
appreciated.
|
|
Posted by Doug McIntyre on October 9, 2008, 7:08 pm
>Cisco router 2651XM with wic-adsl card (Dialer0)
>IOS = c2600-adventerprisek9-mz.124-2.T.bin
>I'm given to understand it is possible to filter traffic based on mac
>address. I've been trawling google but I can't find the syntax I'm
>looking for. At the moment all my router traffic on port 25 is
>unfiltered....
Its only possible to filter based on MAC address for a bridge setup.
General routing does not allow you to filter based on MAC address.
|
|
Posted by Peter on October 9, 2008, 9:47 pm
Greetings,
> I'm given to understand it is possible to filter traffic based on mac
> address. I've been trawling google but I can't find the syntax I'm
> looking for.
There are at least 2 things you need to consider -
As a MAC is a Layer 2 component -
1. MAC ACL's are written in the 7xx (IE Layer 2) series numbering
format (IE 701, 702, etc).
2. A router interface normally operates at Layer 3 (IE as a Routed
interface). You need to operate the interface in Layer 2 mode, and
one way to do that is to BRIDGE it to something else. However this can
bite you as Bridging can impact on performance. You can ensure maximum
throughput but linking the Bridge to a BVI to provide a routed
interface and therefore maximising the Bridge performance.
Cheers................pk.
--
Peter from Auckland.
|
|
Posted by tg on October 10, 2008, 1:49 pm
> Greetings,
<snip>
>. You need to operate the interface in Layer 2 mode, and
> one way to do that is to BRIDGE it to something else. However this can
> bite you as Bridging can impact on performance. You can ensure maximum
> throughput but linking the Bridge to a BVI to provide a routed
> interface and therefore maximising the Bridge performance.
so when you say bridge do you mean I have to connect my router to
another hardware device?
|
|
Posted by Doug McIntyre on October 10, 2008, 2:46 pm
>> Greetings,
>>. You need to operate the interface in Layer 2 mode, and
>> one way to do that is to BRIDGE it to something else. However this can
>> bite you as Bridging can impact on performance. You can ensure maximum
>> throughput but linking the Bridge to a BVI to provide a routed
>> interface and therefore maximising the Bridge performance.
>so when you say bridge do you mean I have to connect my router to
>another hardware device?
Bridging turns off any smarts in your router, it will just pass
traffic in and push traffic right back out. Its most likely not what
you are looking to do.
In general, MAC filtering isn't that useful, what are you trying to
acomplish anyway?
|
Page 1 of 2 1 2 > last >>
| Similar Threads | Posted | | Blocking a MAC address at the router | November 29, 2005, 10:02 am |
| MAC address for switch and router | May 22, 2007, 9:50 pm |
| LAN IP Address of Router resets on its own | May 24, 2007, 1:26 am |
| web config ip address for an 857 router | June 23, 2007, 6:55 am |
| Newbie-Router Unknown IP address | April 4, 2006, 11:39 am |
| Block MAC-Address on a 2851 Router? | December 6, 2007, 1:52 pm |
| MAC Address and Logical Router Interface | November 5, 2008, 5:59 pm |
| Multicast PIM on Router Loopback with no IP address | May 13, 2009, 6:57 am |
| we have private IP address on WAN port, no connection through Router? | October 6, 2005, 4:12 am |
| Client Gateway Address in DHCP - Router or Firewall? | March 1, 2006, 11:00 am |
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML site map
>IOS = c2600-adventerprisek9-mz.124-2.T.bin