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Can I configure two WAN ports on Cisco 5505 to use DSL and new Comcast Business Gateway?

Hello,

A client recently purchased Comcast Business to increase their bandwidth.  I plan on incorporating that on a Cisco 5505 and creating another WAN port and leaving the DSL connection until I'm sure all the tunnel settings (to another office and 2003 Domain Server) are successfully transferred.  We purchased 5 IP addresses and I plan on using that for the new WAN interface on the 5505.  

How do I set this up to aggregate the two connections.  What do I have to be concerned about?  What kind of routing issues will I encounter?  Should the new route have a metric of 2 until I set up the tunnel correctly?

I've already looked at a blog and got the 411 on setting up the interface to the gateway.  Mainly interested in the feasibility of having the DSL and Cable Modem going at the same time.  

Thank you for your help!  
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emjay180
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emjay180
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emjay180VMware EngineerAuthor Commented:
Another way to say it is I plan on using dual ISP in transition.  Any concerns I should have?  Thx.
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mlchelpCommented:
you can use two ISP connections on the 5505 put one on 0/0 and the other on 0/1 you can use one or the other , not both, you do this by the default route, one of them is for failover only

route outside 0.0.0.0 0.0.0.0 X.X.108.158 1 track 1
route backupT1 0.0.0.0 0.0.0.0  x.x.241.177 25

track checks the internet connection on the outside interface every couple of minutes and if it goes down it will fall back to the defaul route on the backup interface untill the isp on the outside interface comes back up.

I have alot of 5505's setup with comcast as the primary because I can get 50up and 20 down and then I use a T1 on the backup interface.
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emjay180VMware EngineerAuthor Commented:
Thank you.  

From what I read, I can't use the 2nd ISP at same time even if I'm going to a different subnet, do you agree with that?

They plan on getting rid of the t1, but I have a vpn set-up with the other office.  Do you know if it just a matter of adding the "isakmp key ****** address (new external address) netmask x.x.x.x" line?

 
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mlchelpCommented:
"From what I read, I can't use the 2nd ISP at same time even if I'm going to a different subnet, do you agree with that?"


No that is not correct, you can use the second isp or T1 just create a route for it, I do it all the time. for example say you want all your internet traffic to go over your DSL but for some reason you want to use your backup Ti to be used to go to google or something, just create another route

route backupT1 x.x.x.x  255.255.255.255  x.x.241.177 1

where x.x.x.x is google or some other websites ip address and x.x.241.177 is the default gateway of your T1

You can get very creative with this and make it work really well

as far as modifying your current VPN, see the link below, it is an excelent article on how to do it, I used it last month to modify one of my offices in India because I changed the ISP and it connected to 15 othere sites via site to site VPN's

 http://www.petenetlive.com/KB/Article/0000391.htm
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emjay180VMware EngineerAuthor Commented:
Thank you for your help!
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mlchelpCommented:
your very welcome.
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