Bonding and bridge strange issue

[Upendra Dhoble]

Hi,
earlier we were using Bridge mode to use corp DHCP for VM's everything working fine

now as each my server has two ether net card , planned to use as load balancing balance-br or alb

now 1st problem
if I use only bonding I can't use bridge mode in GUI and have to use NAT mode for my VM's which doesn't allow me to use corp DHCP ?

2nd Problem : - so what we did is created a bond and then created a bridge using this bond ,
below is the config

auto lo
iface lo inet loopback

iface eth0 inet manual

iface eth1 inet manual

auto bond0
iface bond0 inet manual
slaves eth0 eth1
bond_miimon 100
bond_mode balance-rr

auto vmbr0
iface vmbr0 inet static
address 172.16.28.12
netmask 255.255.252.0
gateway 172.16.28.1
bridge_ports bond0
bridge_stp off
bridge_fd 0

Now the real pain is, I am getting very frequent packet lost and network performance is very poor



Help require of
1) if I want to use bonding what is best way to use corp dhcp , so they can get automatically IP address
2) surprise with so much of packet drops happening , I noticed one LAN card is keep getting on and off and causing packet loss.
actually I was looking for load balancing as we have two Ethernet + also need a bridge mode.
any help greatly appreciated


Upendra

 

[manu]

Hi Uppendra
Your network config is OK, it is perfectly fine a add a bond device to linux bridge like you dit.

We recommand the following bonding modes.
* active-passive bonding mode, which provides high availabilit, when you plug each NICH to a different switch
* 802.3ad (LACP) but you need to have a switch which supports that mode

Other modes are rather untested ( see http://pve.proxmox.com/pve-docs/chapter-sysadmin.html#_linux_bond for details )

 

[Upendra Dhoble]

Thanks for reply, However now the issues is I am not able to get the DHCP IP from my corp network, I can only able to ping host ( proxmox IP) anything specifically need to be done ?

 

[manu]

To debug this:
* try to set an IP adress manually in your VM and see if you can ping the outside world.

If this works, this means a problem with the DHCP server, outside Proxmox.
If this does not work, reboot your host, maybe you have pending network changes.

 

[Upendra Dhoble]

once I changed it to Actiive- backup its worked , just trying to have load balancing to help VM's to boost network performance.
so if I have two NIC can't use them as bonding balance-rr if I need to use Bridge.
if I use only Bonding there is no way to use bridge.

any alternative we can configure in my situation ?

 

[dcsapak]

some bonding modes require support from the switch
e.g. balance-rr needs the ports on the switch grouped together
active backup does not need switch support

for detailed information see this document:
https://wiki.linuxfoundation.org/networking/bonding

 

[Dark26]

i have the same issue.

DHCP + Bridge + bond balance-rr doesn't work.

but with DHCP + Bridge + bond balance-tlb it works.

For my boot on San serveur, its' a problem..

Any idea?

PS: my switch doesn' support lacp ...(BUFFALO BS-MP2008)