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Host address on ether1 of RB433AH

Posted: Sun Mar 02, 2014 8:37 am
by shantidev
Hi,

On my new RB433AH if I connect a host that is configured for DHCP, I get the following IP address/Subnet Mask and Default Gateway info

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Autoconfiguration IPv4 address: 169.254.232.137
Subnet mask: 255.255.0.0
Default Gateway:
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This is confusing me as http://wiki.mikrotik.com/wiki/Manual:De ... igurations mentioned that for RB433xx boards, ether1 is preconfigured with 192.168.88.1/24 address.

Thus, I was expecting to that my host will get a address in 192.168.88.0/24 subnet assuming that there is a DCHP server for ether1 preconfigured.

When I assign static IP address of 192.168.88.2, my host does get this IP when connected to ether1.

So I am not sure why in case of DHCP hosts, it is getting an IP address from 169.254.0.0 subnet.

Please advise.

Thank you.

Re: Host address on ether1 of RB433AH

Posted: Sun Mar 02, 2014 8:48 am
by jarda
Eth1 is normally for wan by default. Therefore does not have sense to run dhcp server on it. For initial connection and setting the device use eth2.

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Re: Host address on ether1 of RB433AH

Posted: Sun Mar 02, 2014 10:42 am
by plisken
Ether 1 is your WAN this must you connect with modem ore router from your provider.
Ether 2,3,4,5 have standard configured a DHCP-server.
Connect the client to ether2,3,4,5

Re: Host address on ether1 of RB433AH

Posted: Sun Mar 02, 2014 6:51 pm
by jarda
Does not have eth4 or eth5.

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Re: Host address on ether1 of RB433AH

Posted: Sun Mar 02, 2014 9:19 pm
by plisken
Yes off cource, is a rb 433, sorry about this my mistake :D

Re: Host address on ether1 of RB433AH

Posted: Sun Mar 02, 2014 9:33 pm
by shantidev
Thanks all for your help.

I will use eth2 then.

But I still have this question of why does my host connected to ether1 gets an ip in the domain of 169.254.0.0. This tells me that ether1 is indeed running a DCHP server in the 169.253.0.0. Is that correct? If so, why dont I see this DHCP server when I select DHCP servers in my winbox.

Re: Host address on ether1 of RB433AH

Posted: Sun Mar 02, 2014 9:54 pm
by plisken
Occasionally you may encounter a host which has somehow assigned itself an IP address in the 169.254.0.0/16 range. This is a particularly common symptom of Windows machines which have been configured for DHCP but for whatever reason are unable to contact a DHCP server. When a host fails to dynamically acquire an address, it can optionally
assign itself a link-local IPv4 address in accordance with RFC 3927. Microsoft's term for this is Automatic Private Internet Protocol Addressing (APIPA).

Short for Automatic Private IP Addressing, a feature of later Windows operating systems. With APIPA, DHCP clients can automatically self-configure an IP address and subnet mask when a DHCP server isn't available

I hope this is clear my friend