From: "Michael Ströder" <michael@stroeder.com> To: galene@lists.galene.org Subject: [Galene] Interferences with Zoom or other VC software Date: Thu, 4 Mar 2021 17:11:13 +0100 [thread overview] Message-ID: <8b13e461-63c9-e2af-f404-2d6448834bc1@stroeder.com> (raw) HI! Disclaimer: This is likely at least partially off-topic. But maybe it's an interesting interop issue relevant for this community. I generally recommend users to switch off all other video-conferencing apps when connecting to my Galène instance. Because often mics and cameras are blocked etc. But hey, users don't care much of what I write. One user had serious connection problems today, we couldn't solve, and thus I've searched through the logs. What I found strange was the IP address 198.251.148.185 connecting to the classic STUN port 3478. This port is not mentioned in Galène's ice-servers.json. Well, could be the usual script kiddy. But the really strange thing is that this seems to be a Zoom address: $ whois 198.251.148.185 NetRange: 198.251.128.0 - 198.251.255.255 CIDR: 198.251.128.0/17 NetName: ZVC NetHandle: NET-198-251-128-0-1 Parent: NET198 (NET-198-0-0-0-0) NetType: Direct Allocation OriginAS: Organization: Zoom Video Communications, Inc (ZVC) We don't have a Zoom client installed. And our own browsers were definitely not participating in any Zoom-related sessions. Any idea what's going on? Are they simply scanning the whole Internet for STUN servers? Or are they tracking other video-conference apps on the client of the remote user? Ciao, Michael.
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