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First of all to be able to configure Mikrotik RB 450, RB 750, etc. This, of course you need to login first  ...
we begin to ya ...

Topology:

For LAN: class C

LAN : x.x.x.x/24.
Modem : y.y.y.y/24




root menu by typing "/"IP settings for each ethernet card 
- Ip address add address = yyyy/24 interface = ether1 
- Ip address add address = xxxx/24 interface = ether2 
- Ip address print
 
Setting the IP routing 
- Ip route add gateway = y.y.y.1
Setting DNS
- Ip dns set primary-dns = pppp allow-remote-requests = yes 
- Ip dns set secondary-dns = nnnn allow-remote-requests = yes
 
Source NAT (Network Address Translation) / MasqueradingFor all existing computers on the LAN can connect to the internet as well.
- Ip firewall nat add chain = srcnat action = masquerade out-interface = ether1
 
DHCP (DynamicHost Configuration Protocol)
Creating an IP Address Pool
- Ip pool add name = dhcp-pool ranges = xxx2-xxx254
 
Add a DHCP Network
- Ip dhcp-server network add address = xx0.0/24 xx0.1 gateway = dns-server = pppp, nnnn
 
Adding a DHCP Server
- Ip dhcp-server add name = DHCP_LAN disabled = no interface = ether2 address-pool = dhcp-pool
 
Until here all computers should already be connected to the Internet. For that we need in the test with: ping to your gateway, pinging your dns and ping to yahoo.com.
 
Bandwidth ControlSpeedy Connection Speed 384/64 Kbps (Download / Upload)The number of client computers 10 pieces.

hopefully can help ..