Obtaining ip from tp-link to mikrotik

fernando143 · Thu Aug 02, 2018 3:50 pm

Hi, I have got an hAP Lite, eth2, eth3, eth4 and wlan are in bridge mode, it works fine, but the problem is with tp-link repeater. When I power on the tp-link, obtains an ip from mikrotik dhcp server, but when I try connect to tp-link, my smartphone still "obtaining ip".
At dhcp server -> leases, I can see the mac address of my smartphone and the status is "offered".
I researched here, in other post about this problem, but I can't resolve my problem with mikrotik and tp-link. This is my schema:

bitmap.png

In the log of mikrotik appears it:

12:09:32 dhcp,debug,packet dhcp1 sending offer with id 3024565349 to 255.255.255.255 
12:09:32 dhcp,debug,packet     flags = broadcast 
12:09:32 dhcp,debug,packet     ciaddr = 0.0.0.0 
12:09:32 dhcp,debug,packet     yiaddr = 192.168.5.7 
12:09:32 dhcp,debug,packet     siaddr = 192.168.5.1 
12:09:32 dhcp,debug,packet     chaddr = 44:80:EB:F1:60:A0 
12:09:32 dhcp,debug,packet     Msg-Type = offer 
12:09:32 dhcp,debug,packet     Server-Id = 192.168.5.1 
12:09:32 dhcp,debug,packet     Address-Time = 86400 
12:09:32 dhcp,debug,packet     Subnet-Mask = 255.255.255.0 
12:09:32 dhcp,debug,packet     Router = 192.168.5.1 
12:09:32 dhcp,debug,packet     Domain-Server = 192.168.5.1,192.168.1.1 
12:09:48 dhcp,debug,packet dhcp1 received discover with id 3024565349 from 0.0.0.0 
12:09:48 dhcp,debug,packet     secs = 30 
12:09:48 dhcp,debug,packet     flags = broadcast 
12:09:48 dhcp,debug,packet     ciaddr = 0.0.0.0 
12:09:48 dhcp,debug,packet     chaddr = 44:80:EB:F1:60:A0 
12:09:48 dhcp,debug,packet     Msg-Type = discover 
12:09:48 dhcp,debug,packet     Client-Id = 01-44-80-EB-F1-60-A0 
12:09:48 dhcp,debug,packet     Max-DHCP-Message-Size = 1500 
12:09:48 dhcp,debug,packet     Class-Id = "android-dhcp-7.1.2" 
12:09:48 dhcp,debug,packet     Host-Name = "motog2014" 
12:09:48 dhcp,debug,packet     Parameter-List = Subnet-Mask,Router,Domain-Server,Domain-Name,Interface-MTU,Broadcast-Address,Address-Time,Renewal-Time,Rebinding-Time,Vendor-
Specific 
12:09:48 dhcp,warning dhcp1 offering lease 192.168.5.7 for 44:80:EB:F1:60:A0 to 30:B5:C2:EF:50:6A without success

In dhcp server - leases shows it:

 #   ADDRESS                                                     MAC-ADDRESS       HOST-NAME                   SERVER                   RATE-LIMIT                   STATUS 
 0 D 192.168.5.10                                                30:B5:C2:EF:50:6A *5\15\10                    dhcp1                                                 bound  
 1 D 192.168.5.7                                                 44:80:EB:F1:60:A0 motog2014                   dhcp1                                                 offered

Hosname *5\15\10 is tp-link repeater and motog2014 is android device.

Can someone help me?

Regards
(Sorry for my english)

mrz · Thu Aug 02, 2018 4:03 pm

Most likely TP link drops DHCP offers

Leinadmontilla · Thu Aug 02, 2018 5:24 pm

The connection of your tp link and mikrotik is via wireless? If yes, try to connect that via wired and test if your cp can now able to obtain an IP from the tplink.

fernando143 · Mon Aug 06, 2018 2:04 am

Sorry for delay.
The connection between Mikrotik and tp-link is via wireless. With wired it works fine, the problem is only with wlan interface.

I said, my mikrotik has eth2, eth3, eth4 and wlan in bridge.

I readed in other posts, a solution is leave without bridge wlan. So now I have bridge from eth2 to eth4, but without bridge in wlan.
Then I tried connect tp-link to wlan, but it wasn't succefull. Again the wi fi shows "obtaining ip", at the dhcp server -> leases, appears the ip of tp-link with state "bound" and appears the ip of my device with its ip and state "offered".

So, I don't understand why is impossible connect tp-link to mikrotik via wireless.
Are there any configuration bad/broken/incorrect in my mikrotik?

mrz · Mon Aug 06, 2018 12:41 pm

As I mentioned TP link is blocking offers, no configuration change on MT router will change that. You can verify that MT sends out offer to each request by looking at DHCP logs or packet sniffer.

fernando143 · Mon Aug 06, 2018 10:40 pm

Yes, I saw, mikrotik sends for each request.
Now I changed the firmware of tp-link to gargoyle firmware, and again I tried to configure in repeater or bridge mode but the problem is same.

So, if the problem appears with different tp-link (701nd and 743nd) and different firmware (factory default and gargoyle firmware). Although mikrotik shows that he is sending out offers by each request, I think, the problem is at mikrotik, in dhcp server or maybe in wlan.

I can't think of another configuration I can try.

mkx · Mon Aug 06, 2018 11:44 pm

Could it be that settings of tp-link and RB's wireless are not compatible? WiFi "repeating" is not a straight-forward business. Search around forum and see if you can make something out of different WAP settings (ap VS ap-bridge VS bridge and how does WPS come into play).

fernando143 · Tue Aug 14, 2018 4:02 pm

Well, I tried with different firmware, ie gargoyle, open-wrt and dd-wrt. But none has worked. So I think the unique way is try with other mikrotik.

nescafe2002 · Tue Aug 14, 2018 4:11 pm

Perhaps the mac address is translated somehow in the repeating process. Could you try with 'always broadcast' either on or off in the MT dhcp server configuration?

Can you do packet captures, one of the dhcp acquisition directly connected to the MT and one via the repeater and compare them?

Obtaining ip from tp-link to mikrotik

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Re: Obtaining ip from tp-link to mikrotik

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