I am trying to replace a ISP router with the RB750G.
They told me that I will need to use VLAN id 1103.
This is an example config for a Cisco router that they send me:
interface GigabitEthernet0/0.1103
encapsulation dot1Q 1103
ip address dhcp
ip nat outside
ip virtual-reassembly
!
Now my question is, how can I setup the RB750G so I can get an IP address from the DHCP on the WAN port 1 and remove the VLAN on the other ports
The same as on Cisco IOS. Add a VLAN on the WAN port, assign a DHCP client to it. It’s a router, so it’ll remove tags on ingress. Assuming you’ll use ether1 for the WAN connection:
/interface vlan
add name=WAN interface=ether1 vlan-id=1103 disabled=no
/ip dhcp-client
add interface=WAN add-default-route=yes use-peer-dns=yes use-peer-ntp=yes
http://wiki.mikrotik.com/wiki/Manual:IP/DHCP_Client
http://wiki.mikrotik.com/wiki/Manual:Interface/VLAN
If you need NAT out that interface:
/ip firewall nat
add chain=srcnat out-interface=WAN action=masquerade
http://wiki.mikrotik.com/wiki/Manual:IP/Firewall/NAT#Source_NAT