troubleshooting Question

Multiple internet connections on one network

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TechRxInc asked on
BroadbandInternet Protocols
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Good evening:

I apologize in advance for the word vague here.   Have a client with a rather elaborate network consisting of a T1 connection on a Cisco Router (that we are not allowed to touch) This has a gateway address on the unnumbered ethernet.  

This plugs into what they call a "core" router a Cisco 3560G on a Vlan 78.  They have all of their workstations on this vlan 78; which is a network (mask /24).  There are 18 other vlans based upon the 10. (so it's a A vari-netted.)  

The "core" also utilizes a default gateway of ..

The idea was to install a 35/5MB link from time warner cable. This has a static IP and a subnet of .252  

Tried creating a port on the Cisco 3560G, called it vlan 802; set it as a trunking port; with access to all the vlans including vlan 78 (where the workstations site.)

Changed the default route on the switch to (time warner connection.)

I can ping the gateway; and interface address from a serial connection into the 3560G. I can ping the vlan address from vlan 78 workstations. However, anytime I originate traffic; it keeps coming back as  

The question being: the switch is IP routing enabled; is it that the time warner device (a motorola bit surfer pro) is too dumb...  why does traffic continue to point back the way it does (the VLAN 78 default gw is .. btw.

Sorry for the lack of information; it's been a long 2 days without sleep ... any help is voluminiously appriciated.
Manager of IT

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