Squid Proxy Server Change Outgoing IP Address

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I have Squid caching proxy server deployed on Rackspace based server in UK. This server has four IP address. I would like to change outgoing IP addresses from default 1.2.3.1 to 1.2.3.4. How do I change proxy server outgoing IP address under Linux or Unix operating systems?

Sed: Find and Replace The Whole Line [ Regex ]

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I have a line as follows in squid.conf file. My sever is hosted in a cloud:

acl verizonfios src 1.2.3.4

My ISP will force an IP address change every week or two. I would like to replace them with a new IP

acl verizonfios src 4.5.6.7

How do I replace the line starting with “acl verizonfios” with new IP address using sed and ssh?