We currently have 2 sites where an Internet POP is located. Both are doing eBGP and EIGRP and have ASAs behind them. One site is a library and the other is city hall. Currently city hall is advertising a /24 associated with the site and the library advertises their own /28 and city hall's /24. City hall uses their internet connection as primary and library's as backup. Library uses theirs as primary and City hall's as backup. Right now, if either ISP fails, outbound traffic failsover to backup and there is no issue with users getting out to the internet. However, when city hall failsover to the library's ISP, even though the libary is advertising city hall's network, no traffic is getting in. We have the NAT and ACL configured for a city hall web server on the library's ASA, but it's still unreachable. Would you have any suggestions on why this would not be working? I can provide more information if needed.
Thank you.