Feature Request: UDP Port Scanning

WindowsStar

Feature Request: UDP Port Scanning 02 November 2013, 06:57

Registered: 13 years ago
Posts: 154

Andrew any possibility to have the option to scan UDP ports as well as the TCP ports. Maybe toggle it on or off? Thanks.

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Andrew

Re: Feature Request: UDP Port Scanning 04 November 2013, 00:02

Admin
Registered: 18 years ago
Posts: 3 518

There are a few UDP services already that the network scanner can discover.

Discovering any UDP port is technically challenging and not anywhere near reliable.

Wikipedia has more info on this.

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WindowsStar

Re: Feature Request: UDP Port Scanning 04 November 2013, 12:34

Registered: 13 years ago
Posts: 154

Thanks for all the extra information.

The other day I found 3 Rogue DHCP servers on our network. I thought that DHCP might be the issues but all the utilities I used could not find or see any DHCP servers except for our REAL DHCP servers for some reason. I had another network guy help me and we used WireShark to finally discover why I was having DHCP issues; we found 3 DHCP servers and I was hoping NetScan would have found them. I used NetScan several times to see if it could find them now that I knew where they were and what IP addresses they were at, but NetScan could not see them no matter how much I tweaked NetScan. With your wiki page link, I now understand that UPD is hard to scan for. Many Thanks -WS

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Andrew

Re: Feature Request: UDP Port Scanning 04 November 2013, 14:29

Admin
Registered: 18 years ago
Posts: 3 518

With DHCP is a different story. Generally there's no need to scan for a specific port.

The network scanner broadcasts a DHCP query and expects any (rogue or legitimate) server to respond.

This didn't work for you?

SoftPerfect support forum

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WindowsStar

Re: Feature Request: UDP Port Scanning 06 November 2013, 10:53

Registered: 13 years ago
Posts: 154

Unfortunately it does not see the Rogue DHCP servers. I does see my real DHCP servers on Windows Server 2008 R2. The Rogue Servers (3 of them) were on a *IX box OS unknown, clever. -WS

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