
You can define network throttling rules to limit the maximum throughput of traffic going from source to target in the backup infrastructure.
Network traffic throttling rules are created and enforced globally, at the level of the Veeam backup server. Rules are set not for a single IP address, but for a pair of IP address ranges: on the source side and on the target side. If IP addresses of the backup infrastructure components at the source and target fall into the specified source and target IP ranges of the rule, the rule is applied to these components.
For example, you have configured the following throttling rule:
| ▪ | Source range: 192.168.0.1 – 192.168.0.30 |
| ▪ | Target range: 192.168.0.1 – 192.168.0.255 |
The backup proxy on the source side has IP address 192.168.0.15 and the backup repository on the target side has IP address 192.168.0.186. Both components fall into the specified IP address ranges, and the network traffic going from this backup proxy to the backup repository will be throttled.
To create a network throttling rule:
| 1. | From the main menu, select Network Traffic. |
| 2. | In the Global Network Traffic Rules window, click Add. |
| 3. | In the Source IP address range section, specify a range of IP addresses for backup infrastructure components from which VM data will be transferred over the network. |
| 4. | In the Target IP address range section, specify a range of IP addresses for backup infrastructure components to which transferred VM data will be targeted. |
| 5. | Select the Throttle network traffic check box. |
| 6. | In the Throttle to field, specify the maximum speed that must be used to transfer VM data from source to target. |
| 7. | In the Apply throttling section, specify the time interval during which the rule should be enforced. You can select to use throttling rules all the time or schedule traffic throttling at specific time intervals, for example, during business hours to minimize the impact of backup and replication activities on the production network. |

If you create several traffic throttling rules for the same range of IP addresses, make sure that time intervals when these rules are enforced do not overlap. For example, to manage network traffic during business and non-business hours, you can create two network traffic throttling rules:
| ▪ | Rule 1 that limits the speed to 1 Mbps Monday through Friday from 7 AM to 7 PM |
| ▪ | Rule 2 that limits the speed to 10 Mbps on weekends and from 7 PM to 7 AM on weekdays |
In this case, Veeam Backup & Replication will limit the data transfer speed to 1 Mbps during business hours, while during non-business hours the speed will be limited to 10 Mbps.
If several throttling rules use the same target IP address range but have different speed limits, the rule with the lowest transfer speed will be used. For example, you have configured two rules:
| ▪ | Rule 1 throttling network traffic to 4 Mbps: source IP range 192.168.0.1 - 192.168.0.30 and target IP range 192.168.0.1 - 192.168.0.255 |
| ▪ | Rule 2 throttling network traffic to 1 Mbps: source IP range 192.168.0.1 - 192.168.0.255 and target IP range 192.168.0.1 - 192.168.0.255 |
Veeam Backup & Replication will use the lowest transfer speed for backup infrastructure components that fall into the source and target IP ranges — that is, a 1 Mbps rule.

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Tip:
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You can view which network traffic throttling rules apply to a backup proxy at the Traffic step of the backup proxy wizard.
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