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jmginer
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in OVH, 2 subnets, 2 interfaces (vrack + pub) and ARP issue.

Fri Jan 23, 2015 11:08 pm

Hello, this config is in a OVH server running with Proxmox and RouterOS installed as KVM VPS.

Proxmox IP: 176.31.229.210
Subnet1: 5.196.187.8/29 <- vRack
Subnet2: 176.31.52.128/27 <- FailOver with vMAC (Internally called public)

I have installed the RouterOS with 2 interfaces:

1 address=5.196.187.9/29 network=5.196.187.8 interface=ether1-vrack actual-interface=ether1-vrack
2 address=176.31.52.128/32 network=176.31.52.128 interface=ether2-public actual-interface=ether2-public

* As you know in OVH, FailOver IPs must be configured with netmask=255.255.255.255 and the gateway must be the HostNode IP ended in .254, so, in my case, the Proxmox IP ended in .254: 176.31.229.254

The issue that I'm having is that OVH is telling me for a missconfiguration because I do unnecessary ARP requests, and is caused by the IP: 176.31.52.128

This is the ARP report provided by OVH
Fri Jan 23 20:42:03 2015 : arp who-has 218.77.79.38 tell 176.31.52.128
Fri Jan 23 20:44:52 2015 : arp who-has 218.77.79.43 tell 176.31.52.128
Fri Jan 23 20:52:42 2015 : arp who-has 54.235.139.235 tell 176.31.52.128
Fri Jan 23 21:23:55 2015 : arp who-has 222.186.134.8 tell 176.31.52.128
Fri Jan 23 21:24:47 2015 : arp who-has 23.23.198.203 tell 176.31.52.128
Fri Jan 23 21:31:50 2015 : arp who-has 222.186.21.112 tell 176.31.52.128
Fri Jan 23 21:38:03 2015 : arp who-has 222.186.56.120 tell 176.31.52.128
Fri Jan 23 21:38:59 2015 : arp who-has 93.174.93.51 tell 176.31.52.128
Fri Jan 23 21:39:36 2015 : arp who-has 116.7.117.187 tell 176.31.52.128
Fri Jan 23 21:43:03 2015 : arp who-has 122.228.207.199 tell 176.31.52.128
I think the issue is that the IPs of the ether2-public are not using the correct gateway.


The public gateway says as is unreachebale.
Image


Instead, if I force a ping, is Ok via the public...

Image



Anybody has any idea about what is wrong? Maybe with the gateway? Any suggestion?

Thanks.

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