Home network problems

[#1]

Got an outbuilding at the back with a basement.
Wanted to put an additional router there with wireless coverage.
So put it short - need 2 wireless routers on the same network. They will be connected to each other with an ethernet cable.
So:
BTO modem ----> Router 1 <-----> Router 2
dick:quote

[#2]

You will need to change one of the routers to be a simple Ethernet switch and wireless access point. You do that by removing the login details for the ADSL connection and turning off the DHCP in the router. You will then need to allocate it a fixed IP which is outside the range of IP addresses allocated by the DHCP on the other router (but on the same subnet).
Mixing hard coded and DHCP addresses is OK if done correctly. You must make sure that the hard coded addresses allocated to things like printers are outside of the range allocated by the DHCP. If you are using a TG582 the default DHCP range is 192.168.1.64 - 192.168.1.252 (192.168.1.253 can't be used either) so your 192.168.1.12 was OK.
If the printer has the option to get it's IP from DHCP the preferred way is to let it get it's IP from the router and then on the router tell it to always allocated the same IP to that device.

[#3]

Further to jelv's suggestion, you could consider these. http://www.devolo.co.uk/consumer/100_dlan-500-av-wireless_starter-kit_product-presentation_1.html?l=... if your outbuilding is on the same mains supply as the house.
I have a previous version of these (no mains plug through) and they work very well.  The wireless AP is dead easy to set up (simpler than reconfiguring a router to an AP) and has the ability to be extended by adding more adapters... Without the need to trail Ethernet cable all over the place.
Notethatthe AP's address needs to be managed in a similar way to how Jelv described the printer - either manually outside of the range used by the router's DHCP 'pool' or by DHCP but marked as reserved.
HTH further?
@jelv,  Note I said mixing manual and DHCP is not ideal - as you say it is ok if done correctly.  The OP has stated that their networking knowledge is very limited, thus keeping it simple seems a safer approach.
Kevin

[#4]

Quote from: jelv

You will need to change one of the routers to be a simple Ethernet switch and wireless access point. You do that by removing the login details for the ADSL connection and turning off the DHCP in the router. You will then need to allocate it a fixed IP which is outside the range of IP addresses allocated by the DHCP on the other router (but on the same subnet). Mixing hard coded and DHCP addresses is OK if done correctly. You must make sure that the hard coded addresses allocated to things like printers are outside of the range allocated by the DHCP. If you are using a TG582 the default DHCP range is 192.168.1.64 - 192.168.1.252 (192.168.1.253 can't be used either) so your 192.168.1.12 was OK. If the printer has the option to get it's IP from DHCP the preferred way is to let it get it's IP from the router and then on the router tell it to always allocated the same IP to that device.

So for the secondary router, it's IP address has to be outside the DHCP range of the first router?

[#5]

Yes