'--address' option on client side.
Harry Mangalam
hjmangalam at gmail.com
Fri Mar 26 20:11:49 UTC 2021
mrcast is interesting (Hadn't stumbled across it before) but while it
handles multicat, it doesn't seem to be able to handle multiple interfaces,
if I read the docs correctly.
Am I wrong?
harry
On Fri, Mar 26, 2021 at 12:29 PM Dan Stromberg <drsalists at gmail.com> wrote:
>
> Hi Harry. Are you the person I worked with at UCI a bit?
>
> Anyway, you might consider trying mrsync; it's intended to do rsync over
> multicast.
>
> HTH.
>
> On Fri, Mar 26, 2021 at 12:22 PM Harry Mangalam via rsync <
> rsync at lists.samba.org> wrote:
>
>> Spent an hour trying to find the answer to this on the various SO, SF,
>> other usual suspects, but have failed.
>>
>> 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
>> ...
>> 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
>> wlp3s0
>> link-local 0.0.0.0 255.255.0.0 U 1000 0 0
>> wlp3s0
>> 192.168.1.0 0.0.0.0 255.255.255.0 U 601 0 0
>> wlx9cefd5fb0bb5
>> 192.168.1.0 0.0.0.0 255.255.255.0 U 602 0 0
>> wlp3s0
>>
>> and while the arp results from the rsyncing machine look OK:
>> $ arp -n
>>
>> Address HWtype HWaddress Flags Mask
>> Iface
>> 192.168.1.107 ether 90:73:5a:f1:23:ee C
>> wlx9cefd5fb0bb5
>> 192.168.1.107 ether 90:73:5a:f1:23:ee C
>> wlp3s0
>> 192.168.1.1 ether 74:d0:2b:5e:32:40 C
>> wlp3s0
>> 192.168.1.139 ether d8:31:34:64:bc:f0 C
>> wlp3s0
>> 192.168.1.139 ether d8:31:34:64:bc:f0 C
>> wlx9cefd5fb0bb5
>> 192.168.1.198 ether 94:94:26:08:b2:4e C
>> wlx9cefd5fb0bb5
>> 192.168.1.1 ether 74:d0:2b:5e:32:40 C
>> wlx9cefd5fb0bb5
>>
>>
>> the arp table from another machine on the same net show this:
>> $ arp -n
>> Address HWtype HWaddress Flags Mask
>> Iface
>> 192.168.1.203 ether b0:68:e6:3d:58:a7 C
>> wlp3s0
>> 192.168.1.107 ether 90:73:5a:f1:23:ee C
>> wlp3s0
>> 192.168.1.186 ether 9c:ef:d5:fb:0b:b5 C
>> wlp3s0
>> 192.168.1.1 ether 74:d0:2b:5e:32:40 C
>> wlp3s0
>> 192.168.1.223 ether 9c:ef:d5:fb:0b:b5 C
>> wlp3s0
>>
>> and the rsync machine is the .186 and .223 above, indicating that the 2
>> interfaces are regarded as the same MAC.
>>
>> The alternating rsync commands generated from pfp are:
>> rsync --address=192.168.1.223 --bwlimit=1000000 -a -s
>> --log-file=/home/hjm/.parsyncfp/rsync-logfile-14.34.52_2021-03-25_16
>> --files-from=/home/hjm/.parsyncfp/fpcache/f.16 '/home/hjm'
>> bridgit:/home/hjm/test
>>
>> and
>>
>> rsync --address=192.168.1.186 --bwlimit=1000000 -a -s
>> --log-file=/home/hjm/.parsyncfp/rsync-logfile-14.34.52_2021-03-25_17
>> --files-from=/home/hjm/.parsyncfp/fpcache/f.17 '/home/hjm'
>> bridgit:/home/hjm/test
>>
>> But the byte streams show only data flowing on one. This is the case
>> whether the rsyncs are started from parsyncfp or via separate rsyncs
>> started from separate shells.
>> Before I go further down the rabbit hole and start messing with ARP
>> tables and network namespaces, was this the intent of the option or am I
>> misunderstanding it?
>> On the server side, the --address option seems to be used to bind the
>> responding IP# and while I haven't tried that, that seems to be
>> straightforward (but not useful for me).
>>
>> thanks in advance for such a magical program
>> Harry
>> --
>>
>> Harry Mangalam
>> --
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>
--
Harry Mangalam
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