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I am using a 4 NIC bond with Bonding Mode: transmit load balancing and a port channel is configured on the switch. I have a DHCP reservation for the IP address being used for the bond. I configured this and restarted network services today, but it's acting really screwy. I can ping the default gateway, and route shows the correct default gateway, but I cannot ping other IPs on the same subnet. I can ping google.com by IP, but not by name because I cannot ping/reach any of the DNS servers on my network. I can randomly communicate with another server on a different subnet, which has allowed me to SSH in.

I am using a Reservation in Infoblox DHCP, should I be using a fixed address instead? I can ping one of Google's IP addresses, but not another.

Modprobe.d/bonding.conf:

alias bond0 bonding
options bond0 mode=5 miimon=100

Bond info: Bonding Mode: transmit load balancing Primary Slave: None Currently Active Slave: eth0 MII Status: up MII Polling Interval (ms): 100 Up Delay (ms): 0 Down Delay (ms): 0

Slave Interface: eth0
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: a0:d3:c1:fd:2d:aa
Slave queue ID: 0

Slave Interface: eth1
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: a0:d3:c1:fd:2d:ab
Slave queue ID: 0

Slave Interface: eth2
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: a0:d3:c1:fd:2d:ac
Slave queue ID: 0

Slave Interface: eth3
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: a0:d3:c1:fd:2d:ad
Slave queue ID: 0
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  • I don't know if this will fix your problem or not, but using port channel with bonding, LACP / 802.3ad is mode=4, not 5.
    – user143703
    Aug 25, 2014 at 20:46
  • I am afraid it did not resolve the issue, thanks. Aug 25, 2014 at 21:00
  • Which mode will obscure the slave MAC addresses and only use the MAC of the bond interface? Are there any that do that? Aug 25, 2014 at 21:01
  • I don't have much experience outside of mode=1 (active / standby) and mode=4 (LACP), so I don't have a definitive answer but my understanding of the various modes.. mode=1 will do that if you explicitly set a different MAC address on the bond. It's lengthy but the official docs have a lot of detail. Look under section 15 (Frequently Asked Questions), specifically question 8.
    – user143703
    Aug 25, 2014 at 21:14

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