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If I set filter = "vnc" part of traffic not detected. Filter "tcp.port rq 5900" work more correct. Dissector not show data from packets like UserInit message, ServerInit, handshake, security options and any other data. Just binary data shown like in any another TCP packet. Also shown only data which was sent from server to client. But I want to see packets with queries from client to server.

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asked 17 Sep '15, 02:27

QuAzI's gravatar image

QuAzI
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accept rate: 0%

edited 17 Sep '15, 02:30

Can you see any traffic at all from your client to anywhere? If not you have an (unfortunately common) issue with your Windows setup. The usual culprits are 3rd party VPN and AV software, do you have any of those installed?

(17 Sep '15, 03:19) grahamb ♦

I have no VPN and AV software installed at this PC. I can see all trafic in real LAN but this host work on VirtualBox 5.0.4 VM.

VM Network adapter settings:

  • Attached to: Host-only Adapter

  • Name: VirtualBox Host-Only Ethernet Adapter

(17 Sep '15, 03:41) QuAzI

VNC Server is RealVNC-5.2.3 (latest at this moment) with disabled security. I try write VNC client but I can't properly view traffic

(17 Sep '15, 03:51) QuAzI

Thanks. This can help resolve tracing trouble.

(17 Sep '15, 04:21) QuAzI

Maybe VB network tracing might help.

permanent link

answered 17 Sep '15, 04:14

grahamb's gravatar image

grahamb ♦
19.8k330206
accept rate: 22%

I don't know why but traffic parsed from VB completely decoded now except some TCP packets

alt text

(17 Sep '15, 04:37) QuAzI
1

That looks normal to me, the first few frames with TCP as the protocol are ones that are "control" information for the TCP connection such as SYN, ACK etc. where there is no VNC protocol information.

The other reason for frames showing as TCP are where the frame contains a portion of the higher protocol PDU. e.g. frames 45, 46, you should see the completed VNC PDU a little further down.

(17 Sep '15, 06:13) grahamb ♦

Thanks for comments. Now everything is good

(17 Sep '15, 07:12) QuAzI

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(17 Sep '15, 07:54) grahamb ♦
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question asked: 17 Sep '15, 02:27

question was seen: 2,664 times

last updated: 17 Sep '15, 07:54

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