[Bridge] DHCP problem on bridge

[Bridge] DHCP problem on bridge

[Kian Yang Liew]

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Dear All,



I have a network with 500 vlan and I bind all these 500 vlan into 1 bridge
interface. Then I have run a dhcp server on this bridge interface to provide
dhcp to all the computer in the vlan. It look find all the time, but
sometime, some of the computer on vlan will not able to get the ip from dhcp
server but after I remove the vlan and add back to the bridge it will work
again. The most serious case is sometime there will be a dhcp problem on
vlan 1 as well, and I need to reboot the server only can make the service
back to normal.



The setting is as below





Vconfig add eth1 2

Vconfig add eth1 3

.

.

.

.

.

.vconfig add eth1 500



Then ifconfig eth1.2 up …. Ifconfig eth1.500 up

Then brctl addbr br1, brctl addif br1 eth1.2 ……. Brctl addif br1 eth1.500



Does anyone have face this problem before? Your reply is highly appreciate.





Thank you.







Regards,

Kian Yang, Liew

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Re: [Bridge] DHCP problem on bridge

[Stephen Hemminger]

On Sun, 31 Oct 2010 00:31:11 +0800
Kian Yang Liew <liewkianyang@gmail.com> wrote:

> Dear All,
> 
> 
> 
> I have a network with 500 vlan and I bind all these 500 vlan into 1 bridge
> interface. Then I have run a dhcp server on this bridge interface to provide
> dhcp to all the computer in the vlan. It look find all the time, but
> sometime, some of the computer on vlan will not able to get the ip from dhcp
> server but after I remove the vlan and add back to the bridge it will work
> again. The most serious case is sometime there will be a dhcp problem on
> vlan 1 as well, and I need to reboot the server only can make the service
> back to normal.
> 
> 
> 
> The setting is as below
> 
> 
> 
> 
> 
> Vconfig add eth1 2
> 
> Vconfig add eth1 3
> 
> .
> 
> .
> 
> .
> 
> .
> 
> .
> 
> .vconfig add eth1 500
> 
> 
> 
> Then ifconfig eth1.2 up …. Ifconfig eth1.500 up
> 
> Then brctl addbr br1, brctl addif br1 eth1.2 ……. Brctl addif br1 eth1.500
> 
> 
> 
> Does anyone have face this problem before? Your reply is highly appreciate.
> 

brctl stp br0 off
brctl setfd br0 0

Re: [Bridge] DHCP problem on bridge

[Liew Kian Yang]

Dear Stephen, 


Thank you for your information. I will try and let you know the result :)


Regards,
Kian Yang, Liew

-----Original Message-----
From: Stephen Hemminger [mailto:shemminger@linux-foundation.org] 
Sent: 2010年11月7日 12:27
To: Kian Yang Liew
Cc: bridge@linux-foundation.org; Liew Kian Yang
Subject: Re: [Bridge] DHCP problem on bridge

On Sun, 31 Oct 2010 00:31:11 +0800
Kian Yang Liew <liewkianyang@gmail.com> wrote:

> Dear All,
> 
> 
> 
> I have a network with 500 vlan and I bind all these 500 vlan into 1 bridge
> interface. Then I have run a dhcp server on this bridge interface to
provide
> dhcp to all the computer in the vlan. It look find all the time, but
> sometime, some of the computer on vlan will not able to get the ip from
dhcp
> server but after I remove the vlan and add back to the bridge it will work
> again. The most serious case is sometime there will be a dhcp problem on
> vlan 1 as well, and I need to reboot the server only can make the service
> back to normal.
> 
> 
> 
> The setting is as below
> 
> 
> 
> 
> 
> Vconfig add eth1 2
> 
> Vconfig add eth1 3
> 
> .
> 
> .
> 
> .
> 
> .
> 
> .
> 
> .vconfig add eth1 500
> 
> 
> 
> Then ifconfig eth1.2 up …. Ifconfig eth1.500 up
> 
> Then brctl addbr br1, brctl addif br1 eth1.2 ……. Brctl addif br1
eth1.500
> 
> 
> 
> Does anyone have face this problem before? Your reply is highly
appreciate.
> 

brctl stp br0 off
brctl setfd br0 0

[Bridge] DHCP problem on bridge

[yu.sheng]

Hi,
  Have you solved this problem? I have a similar one. I bind three eth interfaces to a bridge. I connect eth0 to the dhcp server, and two subnets to eth1 and eth2. The clients in the two subnets try to get IP from the dhcp server.

  My problem is that sometimes the dhcp offer or dhcp pack packets will be delayed in the bridge for such a long time, that the dhcpcd on the client will timeout and thus fail to configure the IP. 

Yu