Route cache is full

[dqq]

Hi,

I have added 1000 OVSIntPort to my proxmox node.

After rebooting i get the following message:

 linux route cache is full consider increasing sysctl net.ipv[4|6].route.max_size

(image attached)

Since then I also have a problems connecting via ssh to my VMs from public IP (dnat set up in iptables)

I have tried setting up this value here, but got error:

root@machine:~# sysctl -w net.ipv4.route.max_size=4147483647
sysctl: setting key "net.ipv4.route.max_size": Invalid argument
net.ipv4.route.max_size = 4147483647

root@machine:~# sysctl net.ipv4.route.max_size
net.ipv4.route.max_size = 2147483647

How can I adjust this setting correctly?

 

[wolfgang]

Hi,

I'm just curious, is there a reason why you use OVS?

route/max_size - INTEGER
        Maximum number of routes allowed in the kernel.  Increase
        this when using large numbers of interfaces and/or routes.
        From linux kernel 3.6 onwards, this is deprecated for ipv4
        as route cache is no longer used.

Source Kernel Documentation/networking/ip-sysctl.txt

 

[dqq]

@wolfgang - yes, we do use it for multiple purposes, mainly for OVSIntPorts, that you don't have in standard Linux networking.

I dont's see how that snippet would help - Am i trying to set something wrong?

 

[wolfgang]

mainly for OVSIntPorts,

And what is the propose of an intiPort in your case?

I dont's see how that snippet would help - Am i trying to set something wrong?

I let you know you can't set it because it is deprecated.
The question is why you run out of routes?
Do you use openVswitch as a router?