I’m new to the routerboard world since my rb450g came in 2 weeks ago.
Being quite the amateur in networking i’m need of a little help.
I have added a simple paint diagram to help visualise my situation.
I have a cable internet connection coming from my ISP’s modem.
Internally i have a 24port gigabit switch connecting my home hardware.
The real issue though is a settop box for my digital tv.
This box needs to connect directly to the port of the modem, meaning that in my situation i have to add a switch behind the modem with the box and modem connected to it. And from that switch go to my internal network with the router doing DHCP.
I however would like to configure my rb450g to act as a switch to the WAN (ether1) and ether2.
This i have configured and is working OK. My settopbox has an external IP so it works fine. I have set ether2 to have master port as ether1.
The problem i’m having is that i want to set ether3, which is connected to my internal network by a gigabit switch, witch a DHCP server.
Setting the DHCP server to ether3 give a red status, invalid.
So how do i get the dhcp server going on my internal network through port3 with internet access?
I hope my explanation is understandable, i’m not used to explaining things in a foraign language
Thx for the help.
This however just hands a local ip to the digitv box.
I have added print outs of my configration.
Am i configuring something wrong?
You say to connect digitv to port 2 AND assign dhcp server to port 2, right?
Port 3-5 are have master port set to 2.
Thank you for helping a totel beginner
[Bart@MikroTik] /interface ethernet> print
Flags: X - disabled, R - running, S - slave
# NAME MTU MAC-ADDRESS ARP MASTER-PORT SWITCH
0 R ether1-gateway 1500 D4:CA:6D:35:12:D3 enabled none switch1
1 R ether2-master-local 1500 D4:CA:6D:35:12:D4 enabled none switch1
2 RS ether3-slave-local 1500 D4:CA:6D:35:12:D5 enabled ether2-master-local switch1
3 RS ether4-slave-local 1500 D4:CA:6D:35:12:D6 enabled ether2-master-local switch1
4 S ether5-slave-local 1500 D4:CA:6D:35:12:D7 enabled ether2-master-local switch1
[Bart@MikroTik] > ip route print
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme,
B - blackhole, U - unreachable, P - prohibit
# DST-ADDRESS PREF-SRC GATEWAY DISTANCE
0 ADS 0.0.0.0/0 94.224.0.1 1
1 ADC 94.224.0.0/20 94.224.12.78 ether1-gateway 0
2 ADC 192.168.1.0/24 192.168.1.1 ether2-master-l... 0
[Bart@MikroTik] /ip dhcp-server> print
Flags: X - disabled, I - invalid
# NAME INTERFACE RELAY ADDRESS-POOL LEASE-TIME ADD-ARP
0 default ether2-master-local default-dhcp 3d
[Bart@MikroTik] /ip dhcp-client> print
Flags: X - disabled, I - invalid
# INTERFACE USE-PEER-DNS ADD-DEFAULT-ROUTE STATUS ADDRESS
0 ;;; default configuration
ether1-gateway yes yes bound 94.224.12.78/20
[Bart@MikroTik] > ip firewall nat print
Flags: X - disabled, I - invalid, D - dynamic
0 ;;; default configuration
chain=srcnat action=masquerade to-addresses=0.0.0.0 out-interface=ether1-gateway
Are you sure that your master settings are correct on those interfaces? The printout, diagram and text are inconsistent.
Look at the master settings - don’t you want Ether 2 to have Ether 1 as master and Ethers 4 & 5 to have Ether 3 as master? That isn’t what the printout shows.
The error on setting a DHCP server to Ether 3 is because it is currently slaved to Ether 2.
The printout is what is now my current configuration as samir told me.
Initially i tried to set ether2 with master ether1. This works great.
I then however cannot set the master port of ether 4 and 5 to ether 3. Because i have already set a master port to ether2 ( only 1 possible? )
This leaves me with just switching between ether 1 and 2.
You can work around the issue by a bridge. e.g. you could switch off any master settings on ports 1 & 2 and then make a bridge and add ports 1 & 2 to the bridge.
You can then set port 3 as the master for ports 4 & 5.
Note that you would have to move the DHCP client off port 1 and assign it to the bridge created above. From what I understand your DHCP server should be on port 3.
The alternative to the above is that you simply remove the master settings on ports 4 & 5 and don’t use those ports - after all you have a 24 port switch hung off port 3 anyway! removing those master settings would allow you to slave port 2 to port 1.
Thx. I’ll try that when i get home.
Are there disadvantages in using the bridge way? Speed and such?
Not that it would make such a big difference as our isp’s speed isnt’t that great
The master/slave arrangement on the switch chip is faster than using the CPU to create a bridge. The fastest arrangement would be to use the master slave arrangement on ports 1/2, connect port 3 to your large switch and forget ports 4 & 5 for now.
When slaving ether 2 to ether1 and forgetting 4 & 5 i cannot add dhcp server to ether 3 ( connected to switch ).
It just states “invalid”.
When setting up bridge.
Ether 1 and 2 in the bridge.
Ether 4&5 slaved to ether 3.
Dhcp client on bridge.
Dhcp server on ether3.
This Also renders the dhcp server invalid.
I can only set dhcp server to ether1 which does not work…
Didn’t think it would be this difficult
Though i don’t want to add aother switch in front of the router.
Winbox, and clients aren’t getting any local ip’s.
Still getting used to command line…
Command line:
[Bart@MikroTik] > ip dhcp-server print
Flags: X - disabled, I - invalid
# NAME INTERFACE RELAY ADDRESS-POOL LEASE-TIME ADD-ARP
0 I default ether3-slave-local default-dhcp 3d
If the interface does not have an IP address assigned to it and you try to add a DHCP server it will show it as “invalid”. Make sure you have assigned an IP address to the interface that the DHCP server is on.
Thank you for pointing that out, damn i was so close everytime. I shouldn’t have missed that.
After changing the local ip to ether3, dhcp server worked.
I have it setup with bridge now. Had to change NAT to the bridge interface for internet access to work too.
But all good now.
