How can I connect a comcast modem to a cisco 2800 series router?

[sderashri]

  I have a comcast business class cable modem and am trying to connect it to my cisco 2821 to route only certain types of traffic.  Is this possible?

[Joseph W. Doherty]

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". . . only certain types of traffic."  Might be possible with PBR.  What certain type are you trying to send across the cable modem?  Where would you direct other traffic?

[Viten Patel]

Hi Shivangi,

If you want to filter out certain traffic like TCP traffic with only certain services like for example if you want to permit only internet traffic (Port 80 - HTTP), you can use Extended Access Lists to do this. If you do not want anyone to telnet into your device then you can block the telnet ports. However, do remember that all access lists by default have a default 'deny all' command at the end. So be careful while configuring the ACL.

[hrtbrkd338]

Yes it's possible. Setting up a policy based route list would do the trick. Create a route-map, bind interesting traffic by using a access list, anything not caught by the route-map will be routed as normal. Oh set the pbr on the incoming interface closest to the comcast cable device.

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