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ka9q / ka9q-radio

Multichannel SDR based on fast convolution and IP multicasting
GNU General Public License v3.0
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Prevent Multicast over LAN #45

Closed azwirko closed 7 months ago

azwirko commented 10 months ago

I'm attempting to run ka9q-radio completely local on an Ubuntu PC and desire NOT to multicast out over my wired LAN. I read there is a "iface" setting in the global section of radiod.conf which I've used, as follows:

[global] iface = lo

But sniffing my LAN I still see traffic go out over the main ethernet interface from my private 192.168 host IP.

I've found someone suggest turning off multicast on my main interface using "sudo ifconfig eno1 -multicast" and ensure its enabled on localhost "sudo ifconfig lo multicast" resulting in:

eno1: flags=67<UP,BROADCAST,RUNNING> mtu 1500 inet 192.168.2.228 netmask 255.255.255.0 broadcast 192.168.2.255 ether b0:4f:13:00:c0:a5 txqueuelen 1000 (Ethernet) RX packets 32472 bytes 22294178 (22.2 MB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 749027 bytes 396046200 (396.0 MB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 16 memory 0x92f00000-92f20000

lo: flags=4169<UP,LOOPBACK,RUNNING,MULTICAST> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 loop txqueuelen 1000 (Local Loopback) RX packets 1798 bytes 316424 (316.4 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 1798 bytes 316424 (316.4 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

But restarting radiod service still pushes multicast data out eno1 onto my LAN. Has anyone successfully used "lo" and ensured they aren't really still sending over their LAN?

Suggestions where to look or what to try next?

Thanks & 73

andyz - K1RA

rrobinett commented 10 months ago

set ttl = 0

On Wed, Dec 6, 2023 at 9:20 PM Andy Zwirko @.***> wrote:

I'm attempting to run ka9q-radio completely local on an Ubuntu PC and desire NOT to multicast out over my wired LAN. I read there is a "iface" setting in the global section of radiod.conf which I've used, as follows:

[global] iface = lo

But sniffing my LAN I still see traffic go out over the main ethernet interface from my private 192.168 host IP.

I've found someone suggest turning off multicast on my main interface using "sudo ifconfig eno1 -multicast" and ensure its enabled on localhost "sudo ifconfig lo multicast" resulting in:

eno1: flags=67<UP,BROADCAST,RUNNING> mtu 1500 inet 192.168.2.228 netmask 255.255.255.0 broadcast 192.168.2.255 ether b0:4f:13:00:c0:a5 txqueuelen 1000 (Ethernet) RX packets 32472 bytes 22294178 (22.2 MB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 749027 bytes 396046200 (396.0 MB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 16 memory 0x92f00000-92f20000

lo: flags=4169<UP,LOOPBACK,RUNNING,MULTICAST> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 loop txqueuelen 1000 (Local Loopback) RX packets 1798 bytes 316424 (316.4 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 1798 bytes 316424 (316.4 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

But restarting radiod service still pushes multicast data out eno1 onto my LAN. Has anyone successfully used "lo" and ensured they aren't really still sending over their LAN?

Suggestions where to look or what to try next?

Thanks & 73

andyz - K1RA

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azwirko commented 10 months ago

Thanks Rob, completely ignoring, commenting out using the "iface" option and setting "ttl = 0" prevented any multi-cast data from leaving my eth0 interface and reaching my LAN.

andyz - K1RA

ka9q commented 7 months ago

Yes, that's what the ttl=0 option is for. I think I even set it to zero by default because of the problems multicast causes to "dumb" switches with slow port and especially to wifi access points.