[sr-dev] [kamailio/kamailio] core: Add virtual flag to listen config to ignore inactive ip addresses (PR #2985)

[rhys-hanrahan]

Just wanted to add a note for one limitation I stumbled onto. As per this thread, if your hosts file contains an entry for your local machine name, then my method for listing local IPs does not work: https://stackoverflow.com/questions/1160963/how-to-enumerate-all-ip-addresses-attached-to-a-machine-in-posix-c

I just tested this out and confirmed it doesn't work. My machine had default entries for localhost only - so this code has worked fine in my testing. Right now I am just thinking of making a note of this requirement in the cookbook.

```
127.0.0.1       localhost.localdomain   localhost
::1             localhost6.localdomain6 localhost6
```

If there's any suggestions for a better way of getting a list of local IPs I'm open to that, but so far I haven't seen an alternative that doesn't have the same issue and is multi-platform.

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