Change the announcement of an IP block in vRack

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Learn how to change the announcement of an IP block in vRack

Knowledge Base

KB0044047

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14.05.2025

Cloud / Dedicated Server (bare metal)

Objective

The vRack is a private network that allows you to configure the address between two or more OVHcloud dedicated servers.

Learn how to set the announcement zone of an IP block in vRack.

Requirements:

A vRack
A configured block of IP addresses in the vRack
Basic network knowledge

This feature might be unavailable or limited on servers of the Eco product line.

Please visit our comparison page for more information.

Instructions

Step 1: Verify the current announcement zone

Begin by checking the current announcement zone of the applicable IP block. To do this, perform a 'traceroute' on an IP of your choice from the block.

traceroute to 1.2.3.4, 30 hops max, 60 byte packets
 1  54.36.52.1 (54.36.52.1)  0.464 ms  0.461 ms  0.454 ms
 2  158.69.61.222 (158.69.61.222)  0.443 ms  0.426 ms  0.411 ms
 3  gra-z1b1-a70.fr.eu (92.222.60.62)  0.394 ms  0.396 ms  0.391 ms
 4  po101.gra-z1g2-a75.fr.eu (92.222.60.119)  0.374 ms  0.356 ms po101.gra-z1g1-a75.fr.eu (92.222.60.117)  0.333 ms
 5  be120.gra-d1-a75.fr.eu (37.187.232.74)  0.327 ms be121.gra-d2-a75.fr.eu (37.187.232.80)  0.335 ms be120.gra-d2-a75.fr.eu (37.187.232.78)  0.328 ms
 6  vl1247.rbx-g1-a75.fr.eu (37.187.231.234)  1.850 ms vl1248.rbx-d2-a75.fr.eu (37.187.231.252)  1.874 ms vl1247.rbx-g1-a75.fr.eu (37.187.231.234)  1.816 ms
 7  10.95.66.51 (10.95.66.51)  1.943 ms 10.95.66.53 (10.95.66.53)  1.872 ms 10.95.66.59 (10.95.66.59)  1.860 ms
 8  1.2.3.4  2.865 ms

In this example, the tested IP address is currently announced to Roubaix. This is visible in the last completed hop: 'vl1247.rbx-g1-a75.fr.eu (37.187.231.234) 1.816 ms.'

Step 2: Change the announcement zone of the IP block

Go to https://ca.api.ovh.com/console/, then sign in with your OVHcloud customer ID. Use the API call below to change the announcement of the IP block.

GET /vrack

This API allows you to retrieve the list of vRack services. If you can't identify the service concerned with these references, they can be found in the OVHcloud Control Panel. To do this, go to the Bare Metal Cloud section, click on Network then “vRack”.

POST /vrack/{serviceName}/ip

This API call makes it possible to change the announcement of an IP block. Fill in the requested fields:

Field	Description
serviceName	Fill in the name of the concerned vRack service. For example: `pn-12345`.
block	Fill in the name of the concerned IP block. Be sure to fill in the IP block, not the IP address that you tested in the previous step. For example: `192.0.2.0/24`.
region	Select the new announcement zone (region) of the IP block. Be sure this is not the same zone as retrieved in the previous step. For example: `bexxx.gra-d1-a75.fr.eu`

Finally, run the API to change the announcement.

Step 3: Test the new announcement zone

Now that the announcement zone is changed, do a 'traceroute' for the IP address used in step 1 to verify it.

traceroute to 1.2.3.4, 30 hops max, 60 byte packets
 1  54.36.52.1 (54.36.52.1)  0.464 ms  0.461 ms  0.454 ms
 2  158.69.61.222 (158.69.61.222)  0.396 ms  0.379 ms  0.372 ms
 3  gra-z1b1-a70.fr.eu (92.222.60.62)  0.360 ms  0.361 ms  0.354 ms
 4  po101.gra-z1g1-a75.fr.eu (92.222.60.117)  0.401 ms  0.396 ms  0.389 ms
 5  be121.gra-d1-a75.fr.eu (37.187.232.76)  0.346 ms be120.gra-d2-a75.fr.eu (37.187.232.78)  0.318 ms be120.gra-d1-a75.fr.eu (37.187.232.74)  0.351 ms
 6  10.73.0.65 (10.73.0.65)  0.625 ms 10.73.0.69 (10.73.0.69)  0.729 ms 10.73.0.65 (10.73.0.65)  0.526 ms
 7  10.17.145.25 (10.17.145.25)  0.354 ms 10.17.145.29 (10.17.145.29)  0.426 ms 10.17.145.25 (10.17.145.25)  0.415 ms
 8  1.2.3.4  2.865 ms

In this example, the tested IP address is now announced to Gravelines. This is visible in the last hop: 'be120.gra-d1-a75.fr.eu (37.187.232.74) 0.351 ms.’