Hi all,

Being a networking rookie I have a problem configuring two newly bought Mikrotik 751g-2HnD routers, to work in an existing home network connected to the internet via router FRITZ!Box Fon WLAN 7570 vDSL.
Namely, the idea was to extend the existing network both for wireless and wired connections, by having two MT routes as simple LAN switches + WiFi access points. It is desirable to keep all machines under the same network IP range. All my machines are connected to one of the MTs either by WiFi or by LAN cable.

To try to make this happen, I daisy-chained the two MT routes (MT1 and MT2), one after another, after the Fritz!Box (FB), like the followig drawing shows:
I left DHCP server on the Fritz!Box.
I bridged all Eth and WLan interfaces. I did the same on both MTs.
I also manually assigned different IPs (double checked they do not conflict with existing IP addresses on the network), to the bridge interface, so I can access the device.
I changed the default MAC addresses of the bridge interface on one of the MT (I thought it may conflict with the another MT router).
I switched off DHCP on both MTs.
DNS on both MTs is pointing to the IP of the gateway Fritz!Box router.
I disabled all firewall rules from both MTs.
I added static routes on MT1 for destination IP address of MT2 and FB, to use interfaces which interconnect them, as gateways. The same I've done for MT2 and FB.

Now, I have the internet connection on all PCs, which is good for start.

However, I have the following pinging issues:
- PC1 cannot ping MT2 (Request timed out)
- PC2 occasionally receives ping replies from MT2, and occasionally Request timed out. There's a kind of periodic pattern: 8-9 replies, 8-9 timeouts.
- MT2 cannot ping FB (request timeout)
- MT2 cannot ping PC1 (request timeout)

Ping between other combinations (PC1-PC2, PC3-MT1 etc) ***DOES*** work.

One additional info when pinging from PC1 to MT2: Torch tool shows that MT1 receives ICMP packets, but transmits nothing. MT2 does not receive any ICMP packets.


Could you please help me find out the couse of not being able to ping machines.
If I'm missing some crucial info here, please let me know and I'll post it.

Thanks in advance.

Bojan

remove most of the ips, and bridge everything together.

if you need more details you can message me again.

remove most of the ips, and bridge everything together.

Everything is bridged already.
What exact IPs do you recommend me to remove? The only IPs that I have manually configured are those on bridge interfaces of the two MTs. Other IPs on PCs are negotiated with DHCP.

ok when you use winbox on any of the pc's can you see all the mikrotik devices?
also check, in you ip neighbors if you can see al your devices, there is a few things you can test with, try putting all the radios in wds mode maybe, could also make a diff for you, also the mac ping tool can do magic to asses that you actually have propper connectivity, under \Int wi reg do you have ok ccq between the devices, and can mac ping the wireless reg's with good latency should be below 15ms.

test those and then get back to me.

ok when you use winbox on any of the pc's can you see all the mikrotik devices?

I do see both MTs from both PC2 and PC3. However, I see none of them from PC1.

also check, in you ip neighbors if you can see al your devices,

As I stated in my original post, only the followin 4 ping combination do not work at all or do not work well - all other pings work as they should.

- PC1 cannot ping MT2 (Request timed out)
- PC2 occasionally receives ping replies from MT2, and occasionally Request timed out. There's a kind of periodic pattern: 8-9 replies, 8-9 timeouts.
- MT2 cannot ping FB (request timeout)
- MT2 cannot ping PC1 (request timeout)

Ping between other combinations (PC1-PC2, PC3-MT1 etc) ***DOES*** work.

there is a few things you can test with, try putting all the radios in wds mode maybe, could also make a diff for you, also the mac ping tool can do magic to asses that you actually have propper connectivity, under \Int wi reg do you have ok ccq between the devices, and can mac ping the wireless reg's with good latency should be below 15ms.

All I said before is based on tests performed in WIRED network. So no radios are involved. I disable radios on all routers. All routers are interconnected with a Cat 7 LAN cable. I wouldn't interconnect routers with WDS when I have cable inplace already, since it is not as fast and reliable solution as with LAN backbone cable. PCs are connected to routers with a normal LAN patch cable.

Check for tx/rx drops on your Ethernet in the stats to see if the cable somewhere isnt damaged, if everything is bridged then i'm actually stumped.

if all else fails then reset the config on all the routers and try again, there is no reason for this.