On 10/31/23 01:18, Dan Ritter wrote:
Mihamina RKTMB wrote:
Hi all,
I rent a dedicated server where I installed an hypervisor and purchased
failover public IPv4 IPs routed to that server.
When configuring the Debian VMs to use those failover IPs, I have to
- set the address to /32: "ip addr add $IP/32 dev eth0"
- set the traffic to the gateway to go through the NIC: "ip route add $GW
dev eth0"
- set the default route to go via the gateway: "ip route add default via
$GW"
As I set the IP address to a /32, the gateway is not (never) in the subnet
of the VM.
When using the Debian installer, at the networking setup, the installer
refuses that setting: the gateway is not in the subnet of the set IP
address.
The workaround I use is either to
- finish the installation without network and then at reboot, setup the
network
- manually setup the network during installation in another console
But isn't there a way to make the Debian installer accept that the gateway
is not in the subnet of the set IP address?
No.
I presume that your server rental includes an address on an IPv4 or IPv6
network via DHCP or as a static assignment. That is how the
server reaches everything else, the default.
You can add more IPs to that interface. If your upstream network
sends traffic there, your machine can recognize it as
appropriate. How should responses go out?
If the IPs are v4 /32 each, the response cannot go out that way.
There is no "way" there. If your upstream network allows it,
your server can use the v4 /32 as the return address, while
sending out to the default router. But you must have an
interface which sits on the same network as the default router.
Here you find an example of ISP documentation describing the fact the IP
address is not in the same subnet as the gateway:
https://help.ovhcloud.com/csm/en-dedicated-servers-network-bridging?id=kb_article_view&sysparm_article=KB0043731#step-4-configure-the-virtual-machines
|ADDITIONAL_IP can be any single IP you purshased, and you see the
netmask set to|
|255.255.255.255 There is no mention to the host (VMWare) IP address in
the VM|
