# Add second device: which network connections are made? **URL:** \ **Category:** Mutual Help\ **Tags:** security\ **Created:** [January 16, 2026, 11:02am UTC](https://forum.delta.chat/t/add-second-device-which-network-connections-are-made/4619 "2026-01-16T11:02:41Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Dio](https://forum.delta.chat/user_avatar/forum.delta.chat/dio/32/1122_2.png) [@Dio](https://forum.delta.chat/u/Dio)\ **Post date:** [January 16, 2026, 11:02am UTC](https://forum.delta.chat/t/add-second-device-which-network-connections-are-made/4619/1 "2026-01-16T11:02:41Z")
**Delta Chat version** 2.35.0 Hi, which network connections are made when adding a second device? The docs say, that both devices need to be on the same network, but my phones are on another vlan. Is some automatic discovery going on? Or is the IP encoded in the QR and the second device tries to connect to this IP on a specific port? ---
**Author:** ![link2xt](https://forum.delta.chat/user_avatar/forum.delta.chat/link2xt/32/1971_2.png) [@link2xt](https://forum.delta.chat/u/link2xt)\ **Post date:** [January 16, 2026, 1:09pm UTC](https://forum.delta.chat/t/add-second-device-which-network-connections-are-made/4619/2 "2026-01-16T13:09:36Z")
IP addresses and ports are encoded in the QR. There is only the LAN connections to these IP addresses, so devices should be on the same network and be able to connect to each other. ---
**Author:** ![Dio](https://forum.delta.chat/user_avatar/forum.delta.chat/dio/32/1122_2.png) [@Dio](https://forum.delta.chat/u/Dio)\ **Post date:** [January 16, 2026, 1:25pm UTC](https://forum.delta.chat/t/add-second-device-which-network-connections-are-made/4619/3 "2026-01-16T13:25:37Z")
That means the port is random? Not always the same? ---
**Author:** ![Dio](https://forum.delta.chat/user_avatar/forum.delta.chat/dio/32/1122_2.png) [@Dio](https://forum.delta.chat/u/Dio)\ **Post date:** [March 19, 2026, 8:12am UTC](https://forum.delta.chat/t/add-second-device-which-network-connections-are-made/4619/4 "2026-03-19T08:12:18Z")
I’ve watched the network traffic. An UDP connection is made on a **random** destination port. As smartphones and computers are in different VLANs here, I’ve managed to add a smartphone as second device after allowing UDP connections to the destination port in the inter VLAN firewall. But because the port is random, I cannot set a permanent rule (besides allowing all UDP connections). That’s a pity. **Feature request:** Use static destination port or port range (if port is already in use), e.g.: - 62444 - 62120-62130 - 62009, 63009, 64009 ---
**Author:** ![ian](https://forum.delta.chat/user_avatar/forum.delta.chat/ian/32/3164_2.png) [@ian](https://forum.delta.chat/u/ian)\ **Post date:** [March 25, 2026, 7:48am UTC](https://forum.delta.chat/t/add-second-device-which-network-connections-are-made/4619/5 "2026-03-25T07:48:40Z")
Could you please edit the title, description, tags and category of the top post to reflect this or open a new topic about the request? ---
**Author:** ![Dio](https://forum.delta.chat/user_avatar/forum.delta.chat/dio/32/1122_2.png) [@Dio](https://forum.delta.chat/u/Dio)\ **Post date:** [March 25, 2026, 9:01am UTC](https://forum.delta.chat/t/add-second-device-which-network-connections-are-made/4619/6 "2026-03-25T09:01:57Z")
I’ve created a feature request here: [Use static network ports for adding a second device](https://support.delta.chat/t/use-static-network-ports-for-adding-a-second-device/4956) ---
**Author:** ![ian](https://forum.delta.chat/user_avatar/forum.delta.chat/ian/32/3164_2.png) [@ian](https://forum.delta.chat/u/ian)\ **Post date:** [March 25, 2026, 9:09am UTC](https://forum.delta.chat/t/add-second-device-which-network-connections-are-made/4619/7 "2026-03-25T09:09:51Z")
Great. Could you then perhaps also mark this topic as solved? ---
**Author:** ![Dio](https://forum.delta.chat/user_avatar/forum.delta.chat/dio/32/1122_2.png) [@Dio](https://forum.delta.chat/u/Dio)\ **Post date:** [March 25, 2026, 11:53am UTC](https://forum.delta.chat/t/add-second-device-which-network-connections-are-made/4619/8 "2026-03-25T11:53:05Z")
Done ---
**Author:** ![r10s](https://forum.delta.chat/user_avatar/forum.delta.chat/r10s/32/1513_2.png) [@r10s](https://forum.delta.chat/u/r10s)\ **Post date:** [October 6, 2026, 3:41pm UTC](https://forum.delta.chat/t/add-second-device-which-network-connections-are-made/4619/9 "2026-10-06T15:41:19Z")