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Not able to ping VM and/or mount NFS after changing IP via POSTROUTING

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0

imagine following setup.

I have a machine A which exports a network share and is reachable under, say 1.1.1.1.

A second B machine with an IP, say 2.2.2.2, is mounting that share, everything's fine.

Now I'm trying to setup some kind of blue/green development.

The machine B starts with the IP 2.2.2.2. When I assign some kind of a new Virtual IP (like ElasticIP from aws, but in my case Floating IP from Hetzner Cloud), I create a new POSTROUTING entry in the iptables with

iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source $FIP

which results correctly in

10      20  1415 SNAT       all  --  *      eth0    0.0.0.0/0            0.0.0.0/0            to:x.x.x.x

That means, the machine B now communicates with the new IP address.

Here comes the pain:

I no longer can mound and/or ping the machine A with the IP 1.1.1.1.
The machine A is 'pingable' from everywhere but from the Machine B with the new IP address.

How come? Any ideas?

Thanks,
xxx

ip nat nfs ping virtual-ip

share|improve this question

asked 6 hours ago

xxxxxx

1

New contributor

xxx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

0

imagine following setup.

I have a machine A which exports a network share and is reachable under, say 1.1.1.1.

A second B machine with an IP, say 2.2.2.2, is mounting that share, everything's fine.

Now I'm trying to setup some kind of blue/green development.

The machine B starts with the IP 2.2.2.2. When I assign some kind of a new Virtual IP (like ElasticIP from aws, but in my case Floating IP from Hetzner Cloud), I create a new POSTROUTING entry in the iptables with

iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source $FIP

which results correctly in

10      20  1415 SNAT       all  --  *      eth0    0.0.0.0/0            0.0.0.0/0            to:x.x.x.x

That means, the machine B now communicates with the new IP address.

Here comes the pain:

I no longer can mound and/or ping the machine A with the IP 1.1.1.1.
The machine A is 'pingable' from everywhere but from the Machine B with the new IP address.

How come? Any ideas?

Thanks,
xxx

ip nat nfs ping virtual-ip

share|improve this question

asked 6 hours ago

xxxxxx

1

New contributor

xxx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

imagine following setup.

I have a machine A which exports a network share and is reachable under, say 1.1.1.1.

A second B machine with an IP, say 2.2.2.2, is mounting that share, everything's fine.

Now I'm trying to setup some kind of blue/green development.

The machine B starts with the IP 2.2.2.2. When I assign some kind of a new Virtual IP (like ElasticIP from aws, but in my case Floating IP from Hetzner Cloud), I create a new POSTROUTING entry in the iptables with

iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source $FIP

which results correctly in

10      20  1415 SNAT       all  --  *      eth0    0.0.0.0/0            0.0.0.0/0            to:x.x.x.x

That means, the machine B now communicates with the new IP address.

Here comes the pain:

I no longer can mound and/or ping the machine A with the IP 1.1.1.1.
The machine A is 'pingable' from everywhere but from the Machine B with the new IP address.

How come? Any ideas?

Thanks,
xxx

ip nat nfs ping virtual-ip

share|improve this question

asked 6 hours ago

xxxxxx

1

New contributor

xxx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source $FIP

10      20  1415 SNAT       all  --  *      eth0    0.0.0.0/0            0.0.0.0/0            to:x.x.x.x

share|improve this question

asked 6 hours ago

xxxxxx

1

New contributor

xxx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 6 hours ago

xxxxxx

1

New contributor

xxx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 6 hours ago

xxxxxx

1

New contributor

xxx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 6 hours ago

xxxxxx

1