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amnuay
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DHCP Snooping on SwOS 2.8 CRS328-24P-4S+RM

Mon Aug 27, 2018 4:45 am

I setup the device with network diagram that i attached in the topic, my problem i configured dhcp-snooping on ether23 when i connected the cable to other port i can not get ip address form dhcp-server if i use ms windows but if i test with ubuntu i can get the ip address, What is wrong ? advice me please.
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k6ccc
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Re: DHCP Snooping on SwOS 2.8 CRS328-24P-4S+RM

Mon Aug 27, 2018 9:56 pm

Do you have DHCP Snooping enabled on the end device ports of the switch (ports 1, 7, 13, & 15 if I counted right)?
RB750Gr3, RB750r2, CRS326-24G-2S (in SwitchOS), CSS326-24G-2S, CSS106-5G-1S, RB260GS
Not sure if I beat them in submission, or they beat me into submission


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amnuay
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Re: DHCP Snooping on SwOS 2.8 CRS328-24P-4S+RM

Tue Sep 11, 2018 6:08 am

This is my lab .
Port 2 = Trusted port
Port 18 = Untrust port
my labtop can not get ip from dhcp server

What wrong ? advice me please.
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amnuay
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Re: DHCP Snooping on SwOS 2.8 CRS328-24P-4S+RM

Tue Sep 11, 2018 6:14 am

My test case switch between trusted & untrust port.
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slx2
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Re: DHCP Snooping on SwOS 2.8 CRS328-24P-4S+RM

Wed Sep 19, 2018 12:40 pm

Hi. I have the same problem on CSS326-24G-2S+. DHCP does not work on Windows Server 2012 and also on Ubuntu, but only when using systemd-networkd DHCP client. It works with isc-dhcp-client. I think the problem is in SWOS firmware.
 
ggallo
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Re: DHCP Snooping on SwOS 2.8 CRS328-24P-4S+RM

Wed Nov 21, 2018 9:14 pm

I also have this problem on a CSS326-24G-2S+RM with SwOS 2.8

I connected the DHCP server to port1 and checked Trusted, and, for all other ports, unchecked Trusted. My Windows 10 laptop didn't get an IP address from DHCP server with this configuration.
If I check Trusted for the port the laptop is connected to, I do get an IP address immediately.
I think this isn't the intended behavior.

I have to mention that I use VLANs, and the DHCP server is on port1 VLAN 500 tagged, and the Windows 10 client is on port24 VLAN500 untagged. I didn't tested this without VLANs.

Anyone have a solution, or any information about this problem from Mikrotik?
 
slx2
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Re: DHCP Snooping on SwOS 2.8 CRS328-24P-4S+RM

Tue Apr 02, 2019 7:04 pm

It seems that latest firmware v2.9 fixes this.

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