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Standard User mfran2002
(newbie) Sun 16-Jul-17 16:23:22
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router technicolor tg582n port forwarding does not work?


[link to this post]
 
Hi all,

I am configuring my router technicolor tg582n for port forwarding.

As I have to reach remotely my PCs I should forward the port UDP 9 to the broadcast address 192.168.1.255.

I found several guides in the web but not regarding the forwarding to broadcast address...

As it does not work, may someone please tell me where the following steps are wrong?

Click Create a new game or application under the heading Pick a task...
In the box labelled "Name" type "Wake on LAN”.
Click Manual Entry of Port Maps
Click Next
Select the protocol UDP from the drop-down menu under the heading Protocol.
Fill in the start port nr (9) and the end port nr (9)
Leave the other boxes empty and click Add.
Click Apply.
Click on the option to Assign a game or application to a local network device
Locate:"Wake on LAN” from the drop-down menu under the heading Game or Application
In the drop-down menu under the heading Device select the name of the device you need to forward ports to.
Select “user-defined…”
Type the broadcast network address: 192.168.1.255
Click Add.

The router should now set up with the port forwarding configuration

Edited by mfran2002 (Sun 16-Jul-17 16:53:34)

Standard User dandnsmith
(experienced) Mon 17-Jul-17 08:41:16
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Re: router technicolor tg582n port forwarding does not work?


[re: mfran2002] [link to this post]
 
It doesn't make sense to forward something addressed to a specific port to a broadcast address - have to forward to an application or machine, else no machine will respond to what seems to be an undirected conversation

Derek

Edited by dandnsmith (Mon 17-Jul-17 08:42:03)

Standard User mfran2002
(newbie) Mon 17-Jul-17 09:37:30
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Re: router technicolor tg582n port forwarding does not work?


[re: dandnsmith] [link to this post]
 
thanks andnsmith for your reply,
yes you are right but i didn't know how to proceed to forward upd 9 to internal broadcast

it is strongly mandatory to wake up a pc via internet:

port forwarding UDP 9 to 192.168.1.255

i tried the way i described but maybe it is wrong, what do you suggest?

many thanks!

PS: when you wake up remotely a pc, you will send a magic packet to its mac address, not to its ip address, this is the reason why you have to forward the magic packet (on upd 9) to all the lan

Edited by mfran2002 (Mon 17-Jul-17 09:47:02)


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Standard User prlzx
(experienced) Tue 18-Jul-17 21:59:58
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Re: router technicolor tg582n port forwarding does not work?


[re: mfran2002] [link to this post]
 
What you really need is a router that can send the Wake-On-LAN packets itself from its web GUI, rather than trying to port forward to a broadcast address.

Wake-on-LAN is unusual in that by design we don't expect the target to reply with a packet. Whereas with port-fowards, the router usually expects to create a NAT mapping of established connections and replies back to the (external) source. So unless the router recognises this as a specific type of application/service (e.g. as they have templates for http, ftp, and games) there is no guarantee you can create a valid port-forward that be accepted on any given model.

Subnet directed broadcasts are often disabled on routers, in part due to being similar to a denial-of-service behaviour in trying to multiply the number of hosts affected, routers usually don't want to just trust the source is friendly especially given a remote source,



prlzx on iDNET: VDSL / 21CN at ~40Mbps / 10Mbps
with IP4/6 (no v6? - not true Internet)
Standard User mfran2002
(newbie) Wed 19-Jul-17 08:51:31
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Re: router technicolor tg582n port forwarding does not work?


[re: prlzx] [link to this post]
 
thanks prlzx for your useful explanations.

unfortunately i do not have another router to try and i have to set up this service

what do you think if, instead of creating an applcation that forward UDP 9 to broadcast, i choose only few critical PCs and forward to each one of them UDP ?

better, example:

forward magic packet from UDP 9991 to UDP 9 pc 192.168.1.10
forward magic packet from UDP 9992 to UDP 9 pc 192.168.1.11
forward magic packet from UDP 9993 to UDP 9 pc 192.168.1.12
forward magic packet from UDP 9994 to UDP 9 pc 192.168.1.13

even if the teamviewer support (i use this to reach remotely my pcs) explicitly speaks about opening upd 9 to broadcast to correclty works... :-/
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