nginx-rtmp can take a source and forward to multiple outputs.
Fairly more advanced is BBC's Brave which is more of an API-driven live video editor that can push to multiple outputs.
It is, sounds like he was trying to port-forward for IPv4, but can't as his ISP uses a CGN or 464XLAT or something to provide IPv4 access - so port forwarding isn't an option.
All that needs to be done is add the appropriate firewall rules (probably on the router and computer) to allow traffic for that port and it'll be accessible from the outside over IPv6.
ArchiveTeam has been, first we were grabbing full pages and images and storing them, but wound up with IP bans (Not unexpected), so a couple of people went through and grabbed the first 500 million images directly from CloudFront, they're still sitting on that 55tb of data.
Following that TwitPic then removed all images from showing on their site and required signed requests to load images from CloudFront so the remaining 300m images can't be fetched yet.
Today TwitPic restored the images and such to their site so AT is stepping back, rewriting their scripts to properly grab pages/images/metadata and will start from the most recent image working backwards and properly store them/removing the earlier grabs as we replicate them.
In the end the data will probably reside in offline storage at the Internet Archive until something happens to the TwitPic site.