troubleshooting Question

PIX 506e - Using BT Business Broadband - IP address range not accessible externally.

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ccfcfcFlag for United Kingdom of Great Britain and Northern Ireland asked on
Hardware FirewallsCisco
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Using a PIX 506e  Pix Version 6.3(4) , using BT Business Broadband as our ISP. IP range allocted to this account.
Recently swapped providers and IP range over ADSL line. Hardware has remained the same, only change being the IP address due to change of provider. Since this change, only a single Ip address is being advertised/accessed.
Of the range only the actual outside address of the PIX firewall is able to be used/accessed. Looking at the router infront of the router (Netgear) we are able to see all IP range being advertised by the PIX so all statics configured through the PIX are hitting the Netgear inside port.
HAve been told that BT differ in the way they configure the way allocation of IP's are provided. Is there any known config issues in conjunction with PIX and BT Business Broadband ?

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