Cable Modem Config on Cisco 1601

Hi im setting up a connection between one of our offices back to our main office. Now on the remote side im going to be using a cisco 1601 with a cable modem connection with a static ip. At our main office we have a 2601 router which has a T1 connection to the net. Now on the 1601 can i use a T1 interface card for the cable modem connection? also i will be using this for vpn traffic so i know i have to create a tunnel on both routers but is there any thing else i would have to do? Also if anybody has any advice on this type of setup i welcome ideas and such.
zeroburnfireAsked:
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JFrederick29Commented:
You can't use a T1 interface for the cable modem as the handoff from the cable modem is Ethernet.  You will need two ethernet interfaces on the 1601 whether physically or virtually via 802.1Q trunking.
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zeroburnfireAuthor Commented:
At the moment the 1601 has only 1 ethernet port eth0 so do they make another add in card for ethernet? or what do you suggest?
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JFrederick29Commented:
I don't believe there is an ethernet add-on for the 1601.  Do you have an 802.1Q trunking capable switch at the site?  If so, you could create a virtual ethernet interface on the 1601 for the cable modem connection but that is the best you can do without using a two ethernet interface router.  You need to be running an IP PLUS IOS image on the 1600 to do trunking.  Can you post a "show version" from the router?
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JFrederick29Commented:
Actually, I'm not 100% positive the 1600 supports trunking/VLAN's.  In the end, you are better off using a two ethernet interface router.
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zeroburnfireAuthor Commented:
Ok well i was hopeing that it would work, but your right! maybe you can answer this then could i use lets say a linksys wrt54gl with ddwrt on it for my router and get the same results?
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JFrederick29Commented:
That Linksys would work for Internet access but I don't believe it has VPN capabilities.  You would need to invest in an RV0xx from Linksys in order to build a site-to-site VPN.
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