Business Community > Switches > DHCP Not Passed through
< Switches

DHCP Not Passed through

This thread has been locked for further replies. You can start a new thread to share your ideas or ask questions.
123

DHCP Not Passed through

This thread has been locked for further replies. You can start a new thread to share your ideas or ask questions.
DHCP Not Passed through
DHCP Not Passed through
2014-09-27 05:16:56
Region : UnitedKingdom

Model : TL-SG1016DE

Hardware Version : V1

Firmware Version : v1

ISP :

I have just bought the TL-SG105E V1 so that I could use 802.1q on a single port. Unfortunately I am finding that while my DHCP server recieves the dhcp request, the other clients never receive the offer, something in the switch is blocking it.

The configuration is:
* VLAN100 - Untagged Port 1, Tagged Port 2
* VLAN101 - Untagged Ports 3-5, Tagged Port 2
* PVID: Port 1 100, Port 2-5 101

Whatever i try, I can't get the switch to pass the DHCP traffic - even though the switch itself will even pick up the DHCP lease and use it if I ask it to.

I have the DHCP running on a tagged interface, but in my debugging i've untagged and run on Port 4/5 - the DHCPOFFER is never received, if I change nothing about the server configuration and plug into a dumb switch instead the DHCP traffic is passed.

Anyone got any ideas, its driving me crazy!
  0      
 
  0      
 
#1
Options
24 Reply
Re:DHCP Not Passed through
2014-09-28 14:14:32
Are you sure that DHCP Server will send the Tagged package?

If your DHCP Server send the Tagged package, in my opinion, your configuration is correct.
  0  
  0  
#2
Options
Same error here
2014-10-05 18:12:44
Same configuration and error... it's not possible to receive a dhcp release.. seems to be a bug? Need some help :-)

Regards
  0  
  0  
#3
Options
Re:DHCP Not Passed through
2014-10-05 21:04:38
I am seeing the same sort of issue. If I plug my access point in the router directly with the four vlans configured and into the trunk port then all is fine. But once I add the TL-SG105E into the equation then I can get ip's on some vlans on some devices and not others although all configured the same?

Kind Regards
  0  
  0  
#4
Options
same issue
2014-10-06 12:51:47
I have the same problem with my TL-SG105E. The router receives and answers the DHCP requests properly, however the answer is never received by the devices connected to the switch. In order to make the devices work i need to set a manual ip-address. If I replace the TL-SG105E in this setup with another switch - without changing anything else - DHCP works fine.
  0  
  0  
#5
Options
Same problem
2014-10-06 12:56:36

jimbobskee53 wrote

I am seeing the same sort of issue. If I plug my access point in the router directly with the four vlans configured and into the trunk port then all is fine. But once I add the TL-SG105E into the equation then I can get ip's on some vlans on some devices and not others although all configured the same?

Kind Regards


I have the same problem with my TL-SG105E. The router receives and answers the DHCP requests properly, however the answer is never received by the devices connected to the switch. In order to make the devices work i need to set a manual ip-address. If I replace the TL-SG105E in this setup with another switch - without changing anything else - DHCP works fine.
  0  
  0  
#6
Options
+1
2014-10-12 22:47:42
I just bought a TL-SG105E and plugged it in and to my surprise no DHCP replies were getting passed. I turned on wireshark and tcpdump on my dhcp server and i saw that the discover was seen and offers were being given from the server. from the client side no offer was recieved. I plugged my test laptop into my TP-Link uplink (to see if the problem was somewhere else in my network) but I saw the offers immediately. For some reason the TP link is blocking DHCP offers.

I tried removing the static IP from the box, but the device itself can get an IP from DHCP, just nothing else connected to it.
This seems like a bug, especially because i turned off any rate limiting or broadcast suppression.

Hope this can get fixed in the next firmware release. but for now I have to static all my IPs to get things to work...
  1  
  1  
#7
Options
Re:DHCP Not Passed through
2014-10-13 13:36:19
+2 Same issue for other UDP traffic as well.
I have two VOIP ATA's that do not recieve traffic when plugged into an "Easy Smart" switch, but work fine with a simple switch.
Also seeing up to 40% packet loss for TCP traffic between ports within each VLAN.

Lanser
  0  
  0  
#8
Options
Re:DHCP Not Passed through
2014-10-13 17:29:50
+1
Same issue

It looks like TP-LINK guys have find the shit and ready to release a beta, good attitude for solving problems, nice indeed

I'll attach the beta link here once I get it for those who suffer the same trouble...Keep focus dudes *_*
  0  
  0  
#9
Options
Re:DHCP Not Passed through
2014-10-14 13:26:21
I've got exactly the same issue with TL-SG105E. Tried with mine TL-SG108E and everything works fine.

Tried also to re-flash the unit with the same FW but the issue is still there.

Any news about the new FW ?
  0  
  0  
#10
Options
Re:DHCP Not Passed through
2014-10-15 14:04:17
I will keep an eye on their website. It should be updated if there is a new FW released. :)
  0  
  0  
#11
Options
123

Information

Helpful: 0

Views: 11524

Replies: 24

Related Articles
 DHCP Not Passed through :(
1418 0
Option 66 does not get passed on to dhcp clients.
3938 2
  Option 66 does not get passed on to dhcp clients.
559 1
 VLAN is not being passed from pfSense to Switch
5272 0
 VLAN ID not passed to router
1820 0
DHCP
237 0
About Us
Press
Copyright © TP-Link Systems Inc. All rights reserved.