'--address' option on client side.

[Harry Mangalam]

Thanks very much for the useful answers.  Much obliged
Harry

On Mon, Mar 29, 2021 at 5:25 AM Paul Slootman via rsync <
rsync at lists.samba.org> wrote:

> On Fri 26 Mar 2021, Harry Mangalam via rsync wrote:
> >
> > I'm trying to improve a parallel rsync wrapper called parsyncfp (pfp)  in
> > response to a user request.  He wants rsync to emit data on multiple
> > interfaces (one interface per rsync instance). From the man page it seems
> > like the '--address' option would do that and in fact using it as such
> does
> > not result in an error, but it also does not result in both interfaces
> > being used, either from pfp or when launched directly from different
> shells.
> >
> > My route (working from home) shows the 2 wlan interfaces up with
> > different IP #s:
> > wlp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
> >        inet 192.168.1.223  netmask 255.255.255.0  broadcast 192.168.1.255
> > ...
> >
> > wlx9cefd5fb0bb5: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
> >        inet 192.168.1.186  netmask 255.255.255.0  broadcast 192.168.1.255
>
> As both interfaces are on the same network, the kernel will use one
> interface to transmit data to that network.
>
> > and route shows:
> > $ route
> >
> > Kernel IP routing table
> > Destination     Gateway         Genmask         Flags Metric Ref    Use
> > Iface
> > default         router.asus.com 0.0.0.0         UG    601    0        0
> > wlx9cefd5fb0bb5
> > default         router.asus.com 0.0.0.0         UG    602    0        0
>
> Here you see wlx9cefd5fb0bb5 has a lower metric, hence it will
> preferentially be used.
>
> You need to dive deeper into linux policy based routing, to force
> traffic e.g. from a particular IP address out over a certain interface.
>
> This is totally outside the scope of rsync; there's nothing rsync can do
> to influence this. You need the 'ip rule' and 'ip route' commands.
>
>
> Paul
>
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-- 

Harry Mangalam
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