## Bonding
Typical bonding configuration

```
modprobe i40e
modprobe bonding
ip link add dev bond0 type bond
ip link set dev eth4 down
ip link set dev eth5 down
ip link set dev eth6 down
ip link set dev eth7 down
ip link set dev bond0 down
echo 802.3ad >/sys/devices/virtual/net/bond0/bonding/mode
echo "layer3+4" >/sys/devices/virtual/net/bond0/bonding/xmit_hash_policy
ip link set dev eth4 master bond0
ip link set dev eth5 master bond0
ip link set dev eth6 master bond0
ip link set dev eth7 master bond0
ip link set dev eth4 up
ip link set dev eth5 up
ip link set dev eth6 up
ip link set dev eth7 up
ip link set dev bond0 up
```

## Troubleshooting

### Packetloss

* This kind of fast ping need to be applied only on ethernet links with MTU 1500. No packetloss should be present.
```
ping -c 1000 -i 0.01 -s1472 127.0.0.1
ping -c 1000 -i 0.01 -s1472 nearby.ip
```

* Check if any dropped counter are increasing
```
tc -s -d qdisc show
```

* Check SFP signal level (if SFP supports DDM/DOM)
```
ethtool -m eth4
```

You might need to tune icmp rate limit if too many people ping this host:
```
net.ipv4.icmp_msgs_per_sec = 10000
net.ipv4.icmp_ratelimit = 100000
net.ipv4.icmp_msgs_burst=1000
```