troubleshooting Question

Adding multiple IP addresses assigned from ISP - Routing problem?

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FIFBA asked on
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I am on a T1 line, previously had 1 IP assigned by ISP, just purchased second IP. T1 line comes into our facility and is now plugged into a switch (previously directly to PIX). A PIX is connected to the switch and works fine using previously assigned IP. I am trying to set up another firewall and map to the new IP. Firewall is plugged into switch, and proper IP's and gateway settings have been verified. I am unable to ping the gateway from this new firewall. I am 99% percent sure there is no error in our new setup but unfortunately the ISP is a local company with, let's just say "inexperienced" technicians.  What are possible problems on the ISP's end that I can have them look at? I think there is some kind of routing issue...can someone provide some ideas? 1st IP address and the 2nd IP address are on same subnet, but it is a /24 subnet. Is this a clue?  Is the new IP routed in some kind of way that will not work for our specific needs? All input is appreciated.
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