Router - TG582N - 3G

3G setup

(From a customer) I've only worked out some of this, but I found the following got a dongle working:

 {Administrator}=>mobile ifadd intf=umts
 {Administrator}=>mobile ifconfig intf=umts apn=CHANGEME
 {Administrator}=>ppp ifadd intf=mobilebroadband
 {Administrator}=>ppp ifconfig intf=mobilebroadband dest=umts
 {Administrator}=>nat ifconfig translation=enabled intf=mobilebroadband
 {Administrator}=>ppp rtadd intf=mobilebroadband dst=0.0.0.0
 {Administrator}=>exit

I then went to the web interface http://192.168.1.254/_pppom_cfg.lp?be=0&l0=2&l1=2&name=mobilebroadband - replace 192.168.1.254 with the IP address of your router, and entered the username, password, and APN. For my vodafone SIM, the username was web, the password was web, and the APN was pp.internet.

Some further notes and sources on my blog:

(feel free to copy here if you want)

Enabling 3G fallback

The most common usage of 3G with the TG582n will probably be to use 3G as a fallback link in the event of the ADSL link going down. There are several ways of achieving this, depending on the degree of automation required and the network/tariff used for 3G. The following notes are intended to provide guidance, but are unlikely to result in resiliance on a par with the Office::1 product.

To configure the 3G link to be permanently up, but traffic only routed when the ADSL link is down, follow the instructions above but then do:

 {Administrator}=>ppp rtdelete intf=mobilebroadband
 {Administrator}=>ppp rtadd intf=mobilebroadband dst=0.0.0.0 metric=20
 {Administrator}=>ppp ifconfig intf=mobilebroadband dnsmetric=20

(This assumes that the routing metric and dns metric for the ADSL link are both set to 10. Larger numbers represent a higher "cost", so interfaces with lower costs will be preferred).

"Dial" on Demand

One may not want the 3G link to be permanently up, in which case it is possible to configure the 3G link to be "dial" on demand - i.e. the link will be brought up and torn down as needed when the ADSL link fails and is restored.

This may cause problems for users if the 3G network issues a different IP address each time the link is brought up.

The configuration involves setting the interface to be "dial" on demand; setting a time delay before the link is brought up when needed; setting a time that the link can be idle for before the link is torn down; and deciding how the link is considered idle. The commands needed are:

 {Administrator}=>ppp ifconfig intf=mobilebroadband demanddial=enabled

That enables "dial" on demand.

 {Administrator}=>ppp ifconfig intf=mobilebroadband doddelay=120 idletime=300 idletrigger=RxTx

where doddelay (in seconds) sets the time delay before packets will bring up the link, idletime (in seconds) sets the time that link can be idle for before being torn down, and idletrigger defines whether link idleness is determined by Rx, Tx, or RxTx packets.

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