Restricting the outgoing source IP address of the IPv6 explicit web proxy
You can use the following command to restrict the source address of outgoing web proxy packets to a single IPv6 address. The IP address that you specify must be the IPv6 address of an interface that the explicit HTTP proxy is enabled on. You might want to use this option if the explicit HTTP proxy is enabled on an interface with multiple IPv6 addresses.
For example, to restrict the outgoing packet source address to 2001:db8:0:2::50:
config http-proxy explicit
set outgoing-ip6 2001:db8:0:2::50
end