[rds-devel] [BUG] Confirmation on RDS Namespace Behavior

[Santosh Shilimkar]

> On Dec 14, 2021, at 7:18 PM, Liu, Congyu <liu3101 at purdue.edu> wrote:
> 
> Hi,
> 
> I am writing to ask about the behavior of rds socket binding behaviour in multiple network namespaces.
> 
> In the test I recently performed there is a confusing case. Let's say there are two network namespaces A and B. Both A and B has a tun device, and these two tun devices have the same IPv4 address. In namespace A a process creates a rds socket and binds it to namespace A's tun device. It works. But then in namespace B a process creates a rds socket and binds it to namespace B's tun device, it fails with error code EADDRINUSE. Is this the expected behavior? 
> 
> In other words, can rds sockets from different network namespaces bind to the same address? 
> 

Its not a BUG but missing RDS namespace support. There was some effort done to add network
namespace support but wasn’t completed and developer doing it moved on. 

Regards,
Santosh