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Thread: SRV DNS Lookup

  1. #1
    Join Date
    April 2014
    Posts
    4

    SRV DNS Lookup

    Code:
    19.10.2018 10:15:20	TSDNS	Info	A/AAAA DNS resolve for possible TSDNS successful, "dyns.ml" =(h: 2a03:4000:2:7b1::3 p:0), (h: 46.38.236.237 p:0)	
    19.10.2018 10:15:20	TSDNS	Info	SRV DNS resolve successful, "_ts3._udp.ts.dyns.ml" =(h: ts.syhm.de p:9987)	
    19.10.2018 10:15:20	TSDNS	Info	SRV DNS resolve unsuccessful, "_tsdns._tcp.dyns.ml" Domain name not found	
    19.10.2018 10:15:20	TSDNS	Info	A/AAAA DNS resolve successful, "ts.syhm.de" =(h: 2a03:4000:2:7b1::2 p:0), (h: 46.38.236.237 p:0)	
    19.10.2018 10:15:20	ClientUI	Info	Lookup finished: ip=2a03:4000:2:7b1::2 port=9987 query=ts.dyns.ml error=0	
    19.10.2018 10:15:20	ClientUI	Info	Resolve successful: [2a03:4000:2:7b1::2]:998746.38.236.237:9987	
    19.10.2018 10:15:20	ClientUI	Info	Initiating connection: [2a03:4000:2:7b1::2]:9987	
    19.10.2018 10:15:20	TSDNS	Info	A/AAAA DNS resolve successful, "ts.dyns.ml" =(h: 2a03:4000:2:7b1::2 p:0), (h: 46.38.236.237 p:0)	
    19.10.2018 10:15:20	TSDNS	Info	A/AAAA DNS resolve for possible TSDNS successful, "ts.dyns.ml" =(h: 2a03:4000:2:7b1::2 p:0), (h: 46.38.236.237 p:0)
    Why is the client doing a tsdns SRV lookup when the ts3 SRV lookup before was successfull?

  2. #2
    Join Date
    June 2008
    Posts
    18,405
    It could be that on the SRV address is a TSDNS server running and the client could take the given address in case there was a TSDNS server running.
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    TeamSpeak FAQ || What should i report, when i open a client thread?

  3. #3
    Join Date
    April 2014
    Posts
    4
    So this behavior is by design and there is nothing wrong. The connection is established blazing fast, I was just wondering about the second unnecessary lookup.

  4. #4
    Join Date
    June 2008
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    18,405
    Yes its by design. Without the client can't know if there is such TSDNS server behind the SRV.
    When sending me private messages: Please make sure to include reference link to your forum thread or post.

    TeamSpeak FAQ || What should i report, when i open a client thread?

  5. #5
    Join Date
    April 2014
    Posts
    4
    Hmm ... why does the client need to know if there is a TSDNS server anyway when there is a working ts3 SRV record and therefore no need for TSDNS?

  6. #6
    Join Date
    June 2008
    Posts
    18,405
    We had hoster wo wnated to run a TSDNS server behind the SRV and so we did add this.

    TSDNS is not needed since SRV works, but as long it is supported we have this check.
    When sending me private messages: Please make sure to include reference link to your forum thread or post.

    TeamSpeak FAQ || What should i report, when i open a client thread?

  7. #7
    Join Date
    June 2011
    Location
    Germany
    Posts
    4,371
    The TS3 client sends all lookups at once and evaluates the answers as they arrive. Given that there can only be one SRV TS3 lookup and SRV TS3 has the highest priority, TeamSpeak can connect to SRV TS3 right away, as no response with a higher priority can arrive. As you noted, this is fast.

    Your other concern, the useless lookup, is correct as well. ANR Daemon on this forum once often points out that this behavior illegal, but do not know the RFC that could have stated that.

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