so ive been trying to get Winlink working for about two weeks now and i think i finally understand what im doing but wanted to check with people who actually use this regularly. my main confusion was around the RMS gateways and how message routing actually works. like i kept assuming the gateway i connect to stores my mail but thats not how it works right? it all goes up to the CMS in the cloud or whatever and the gateway is just a relay basically.

anyway my current setup is a IC-7300 running into a SignaLink USB, using Winlink Express on a pretty old laptop running win10. i got VARA HF working after some pain with the soundcard settings but i can see nearby gateways in the map now. managed to send a test message to my own callsign and got it back so i think the path is working.

the part thats still fuzzy for me is how to handle messages when im doing EMCOMM stuff and the internet is actually down. does the RMS gateway itself need internet to forward to the CMS? cause if so then like... whats the point during a real emergency when the backbone might be down. been reading about Winlink Hybrid network but got confused fast. anyone actually deployed this in a real or simulated exercise?

yeah youre right about the gateway just being a relay, thats exactly how it works. the CMS handles all the actual mailbox storage and there are like 5 or 6 redundant CMS servers around the world so they sync with each other. the RMS gateway just needs a working internet connection to talk to the CMS, so if the internet at that node is down then yeah that gateway is useless for getting to the wider network.

but heres the thing - for actual served agency comms in a real event you dont necessarily need to reach the CMS. you can do direct peer to peer with Winlink Express using the RMS Relay mode, which lets gateways store and forward without needing internet. its called a Winlink hybrid network scenario. i did a ARES exercise last fall where we simulated total internet loss and used a local RMS running in relay mode to pass ICS-213 forms between the EOC and a shelter site like 40 miles away, worked fine. you do have to set it up ahead of time though, you cant really improvise that during an activation.

also your IC-7300 plus SignaLink setup is solid for this, VARA HF makes a big difference over older modes like Pactor or even WINMOR if youre dealing with mediocre band conditions.

the relay mode thing the other guy mentioned is what you want to look at. i will say from experience though, getting a group to actually pre-configure that before an event is like herding cats. everyone assumes someone else did it.

one thing i ran into with a similar setup - check your VARA modem bandwidth setting, if the gateway youre hitting is configured for VARA 500 and youre trying to connect with VARA 2300 it'll just sit there doing nothing and you wont get a great error message about why. wasted an embarrassing amount of time on that.