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LubosD
Apprentice
Joined: 30 Jun 2005
Posts: 211
Location: Czech Republic
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 Posted: Mon Jun 04, 2012 7:09 pm Post subject: Bridge not letting DLNA multicasts through |
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Hello,
I have a network bridge br0 that joins interfaces eth0 and wlan0 (master mode). I have a minidlna daemon that sends multicasts on br0 to let DLNA-compatible devices know about itself.
I can see the packets leave br0:
| Code: | # tshark -i br0 | grep 255
Running as user "root" and group "root". This could be dangerous.
Capturing on br0
1.132010 10.10.10.3 -> 239.255.255.250 SSDP 329 NOTIFY * HTTP/1.1
1.132019 10.10.10.3 -> 239.255.255.250 SSDP 320 NOTIFY * HTTP/1.1
1.132024 10.10.10.3 -> 239.255.255.250 SSDP 372 NOTIFY * HTTP/1.1
1.132029 10.10.10.3 -> 239.255.255.250 SSDP 384 NOTIFY * HTTP/1.1
1.132033 10.10.10.3 -> 239.255.255.250 SSDP 386 NOTIFY * HTTP/1.1
1.132037 10.10.10.3 -> 239.255.255.250 SSDP 400 NOTIFY * HTTP/1.1
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But these packets are not being actually sent anywhere. When I run tshark -i eth0, I can't see any of them. TVs are having big problems seeing the DLNA server, the server shows up only occasionally.
What do I do to stop Linux from filtering these packets? |
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swanson
Tux's lil' helper
Joined: 04 Jun 2004
Posts: 149
Location: Edinburgh, Scotland
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| Posted: Tue Jun 05, 2012 11:04 am Post subject: |
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Good question as I have exactly the same problem that I've been flummoxed by for a while. Tried variations of network routes, firewall, sysctl settings and kernel options but no joy. Suspect most people aren't using a bridge with minidlna.
_________________
Alan. |
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LubosD
Apprentice
Joined: 30 Jun 2005
Posts: 211
Location: Czech Republic
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| Posted: Tue Jun 05, 2012 11:11 am Post subject: |
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My idea was to use ebtables. It has stuff like "-d Multicast", so I wanted to do:
| Code: | | ebtables -A FORWARD -o eth0 -d Multicast -j ACCEPT |
But it changed nothing. |
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LubosD
Apprentice
Joined: 30 Jun 2005
Posts: 211
Location: Czech Republic
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| Posted: Wed Jun 13, 2012 2:57 pm Post subject: |
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The problem has already been brought up with kernel bridge devs, but to no avail.
So I created an ugly hack that fixes the problem for me.
| Code: | --- linux/net/bridge/br_device.c.orig 2012-06-13 16:52:14.557429094 +0200
+++ linux/net/bridge/br_device.c 2012-06-05 15:26:17.340602795 +0200
@@ -52,7 +52,7 @@
if (is_broadcast_ether_addr(dest))
br_flood_deliver(br, skb);
else if (is_multicast_ether_addr(dest)) {
- if (unlikely(netpoll_tx_running(dev))) {
+ if (unlikely(netpoll_tx_running(dev)) || true) {
br_flood_deliver(br, skb);
goto out;
}
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This *does* have other implications, but in my use case, it is just fine. |
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BT
Guru
Joined: 13 Jun 2004
Posts: 318
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| Posted: Mon Jul 16, 2012 1:41 pm Post subject: |
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| I previously had the same issue where my TV would only occasionally see MiniDLNA. I'm now successfully using MiniDLNA with a bridge. Turns out I was building my kernel without IP multicasting enabled (CONFIG_IP_MULTICAST). I also have IGMP/MLD snooping (CONFIG_BRIDGE_IGMP_SNOOPING) enabled but have yet to determine if that makes any difference. |
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LubosD
Apprentice
Joined: 30 Jun 2005
Posts: 211
Location: Czech Republic
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| Posted: Mon Jul 16, 2012 1:50 pm Post subject: |
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| BT wrote: | | I previously had the same issue where my TV would only occasionally see MiniDLNA. I'm now successfully using MiniDLNA with a bridge. Turns out I was building my kernel without IP multicasting enabled (CONFIG_IP_MULTICAST). I also have IGMP/MLD snooping (CONFIG_BRIDGE_IGMP_SNOOPING) enabled but have yet to determine if that makes any difference. |
I have both enabled and it doesn't work as expected. |
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joe82
n00b
Joined: 10 Feb 2006
Posts: 23
Location: Ludwigsburg, Germany
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| Posted: Sun Oct 28, 2012 7:44 pm Post subject: |
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Hey,
seems I have the same problem. Recently MediaTomb stopped working (PS3 didn't discover the media server).
At first, I supposed it had something to do with the ebuild removal, but after trying out rygel and minidlna, both of which worked only occasionally, I'm pretty much stucked.
Both kernel options are built in, is there any solution yet?
Greets
Jörg |
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joe82
n00b
Joined: 10 Feb 2006
Posts: 23
Location: Ludwigsburg, Germany
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joe82
n00b
Joined: 10 Feb 2006
Posts: 23
Location: Ludwigsburg, Germany
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| Posted: Sat Nov 03, 2012 3:47 pm Post subject: |
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Seems that the upgrade to hardened-sources 3.5.4 was responsible for those problems.
Booting hardened-sources 3.4.5, everything is working as expected.
uname -a:
| Code: | | Linux **** 3.4.5-hardened #1 SMP Sun Aug 12 16:59:10 CEST 2012 x86_64 AMD Athlon(tm) II X2 240e Processor AuthenticAMD GNU/Linux |
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Hu
Administrator
Joined: 06 Mar 2007
Posts: 23369
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| Posted: Sat Nov 03, 2012 4:07 pm Post subject: |
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| joe82 wrote: | Seems that the upgrade to hardened-sources 3.5.4 was responsible for those problems.
Booting hardened-sources 3.4.5, everything is working as expected. |
Is the problem with the v3.5 kernel series in general or with the hardened patches in particular? |
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joe82
n00b
Joined: 10 Feb 2006
Posts: 23
Location: Ludwigsburg, Germany
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| Posted: Sun Nov 04, 2012 3:41 pm Post subject: |
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| Hu wrote: | | Is the problem with the v3.5 kernel series in general or with the hardened patches in particular? |
Seems the problems are not related to the hardened patches.
I compiled gentoo-sources-3.5.7 with the same options as my hardened version, and my DLNA clients (PS3 and Android phone) still have problems discovering the miniDLNA-server. |
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joe82
n00b
Joined: 10 Feb 2006
Posts: 23
Location: Ludwigsburg, Germany
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| Posted: Fri Dec 28, 2012 9:34 pm Post subject: |
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As far as I can tell, the problems are gone with hardened-sources-3.7.0
That's good news, finally... |
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Robert S
Guru
Joined: 15 Aug 2004
Posts: 463
Location: Canberra Australia
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| Posted: Sat Dec 29, 2012 10:12 pm Post subject: |
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| Don't know if this has anything to do with it but I purchased a new router (Netgear DGND3700v2) and I had no problems with DLNA. I did the recommended firmware upgrade and it stopped working. Since I downgraded the firmware to the original version (V1.1.00.08_1.00.08 ) everything has been fine. |
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Networking & Security
