igmpproxy - MRT_DEL_MFC; Errno(2): No such file or directory

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s3n0
DD-WRT Novice


Joined: 02 May 2014
Posts: 48
Location: Slovakia

PostPosted: Thu Jun 01, 2017 14:02    Post subject: igmpproxy - MRT_DEL_MFC; Errno(2): No such file or directory Reply with quote
Hi all !

Please, would anyone know how to explain exactly what this error means ? I see it often in LOG on firmware DD-WRT r31924 (TP-Link TL-WR740N-V5), but also on firmware from Tomato Shibby Advanced v.140 (Asus RT-N16).

Code:
May 31 17:14:41 r0ut3r user.warn igmpproxy[1193]: MRT_DEL_MFC; Errno(2): No such file or directory
May 31 17:18:52 r0ut3r user.warn igmpproxy[1193]: MRT_DEL_MFC; Errno(2): No such file or directory
May 31 17:18:52 r0ut3r user.warn igmpproxy[1193]: MRT_DEL_MFC; Errno(2): No such file or directory
May 31 17:18:52 r0ut3r user.warn igmpproxy[1193]: MRT_DEL_MFC; Errno(2): No such file or directory
May 31 17:23:01 r0ut3r user.warn igmpproxy[1193]: MRT_DEL_MFC; Errno(2): No such file or directory
May 31 17:27:11 r0ut3r user.warn igmpproxy[1193]: MRT_DEL_MFC; Errno(2): No such file or directory


Multicast on my network works fine. I also have a blocked multicast for WiFi network using the script (Administration> Commands> firewall script):

Code:
insmod ebtables
insmod ebtable_filter
insmod ebt_pkttype
ebtables -A FORWARD -o ath0 --pkttype-type multicast -j DROP
ebtables -A OUTPUT -o ath0 --pkttype-type multicast -j DROP


I know igmpproxy is a multicast management service on the network. However, this error message does not make sense to me. I do not know what file it is and why it was not found. I admit that this problem can cause anything. I am particularly interested in an error message regarding a non-existent file.

What does "MRT" or "MFC" mean ? Is this a kind of multicast-cache ? All right, but why is there no file ?

On the internet, I found a lot about the igmpproxy daemon configuration, but no solution to this problem and nothing specifically about the missing file or directory.


Thanks.

_________________
Asus RT-N16 @ Fresh Tomato (2019.3.118)
Asus RT-N18U @ Fresh Tomato (2019.3.118)
Asus RT-AC66U-B1, H/W Ver.:B2 @ Asuswrt Merlin (384.13)
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Per Yngve Berg
DD-WRT Guru


Joined: 13 Aug 2013
Posts: 5695
Location: Akershus, Norway

PostPosted: Thu Jun 01, 2017 18:30    Post subject: Reply with quote
Remove the ebtables blocks.

Multicast works without them with this build.
Putting the IP-TV Decoder on a separate VLAN also helps.
s3n0
DD-WRT Novice


Joined: 02 May 2014
Posts: 48
Location: Slovakia

PostPosted: Thu Jun 01, 2017 19:41    Post subject: Reply with quote
Hi.

So, I removed the firewall script in the DD-WRT web interface configuration. Then I switched the WiFi interface configuration from bridged to unbridged (WebGUI > Wireless > tab "Basic Settings" > check the "Advanced Settings" > Network Configuration: Unbridged). In the expanded "unbridged WiFi" configuration, I left all the settings unchanged - so the Multicast Forwarding feature remains inactive.

Multicast (IPTV) also works well, just like using ebtables. So it does not matter if I block WiFi-Multicast via ebtables or via WebGUI.

However, the whole LOG problem persists. In the SysLOG statement, you can still see the above mentioned warning (a bug of a not found file or directory). I still do not understand this error message. What is a file? And why does the igmpproxy service need it?

_________________
Asus RT-N16 @ Fresh Tomato (2019.3.118)
Asus RT-N18U @ Fresh Tomato (2019.3.118)
Asus RT-AC66U-B1, H/W Ver.:B2 @ Asuswrt Merlin (384.13)
Per Yngve Berg
DD-WRT Guru


Joined: 13 Aug 2013
Posts: 5695
Location: Akershus, Norway

PostPosted: Thu Jun 01, 2017 20:19    Post subject: Reply with quote
Code:
   rc = setsockopt( MRouterFD, IPPROTO_IP, MRT_DEL_MFC,
                    (void *)&CtlReq, sizeof( CtlReq ) );
    if (rc)
        my_log( LOG_WARNING, errno, "MRT_DEL_MFC" );

    return rc;


It's about removing a route to a multicast destination.
s3n0
DD-WRT Novice


Joined: 02 May 2014
Posts: 48
Location: Slovakia

PostPosted: Thu Jun 01, 2017 20:55    Post subject: Reply with quote
Well thank you.

This is, in my opinion, a standard operation - removing the inactive or dropped Multicast connection. Or am I wrong ? Why it is reported as a bad operation in LOG. Grrr... .

Is there a BUG in igmpproxy daemon compiled into DD-WRT firmware ? This error message is still nonsensical. Is it a universal error report ? Is it possible to solve it somehow ?

I am aware that this message is not a security flaw or a DD-WRT kernel bug. I just wanted to know what it means. I hate it because I see the error message often lately.

_________________
Asus RT-N16 @ Fresh Tomato (2019.3.118)
Asus RT-N18U @ Fresh Tomato (2019.3.118)
Asus RT-AC66U-B1, H/W Ver.:B2 @ Asuswrt Merlin (384.13)
Pdobrien3
DD-WRT User


Joined: 12 Dec 2015
Posts: 116

PostPosted: Fri Apr 06, 2018 10:23    Post subject: Reply with quote
I am also getting this error in my logs. No idea what I did to deserve it Very Happy

user.warn igmpproxy[11374]: MRT_DEL_MFC; Errno(2): No such file or directory

Any help would be appreciated.

Thanks
jpp
DD-WRT Novice


Joined: 26 Sep 2017
Posts: 28

PostPosted: Thu May 17, 2018 23:03    Post subject: Reply with quote
I am using : DD-WRT v3.0-r34929 mega 02/12/18 on a e1200 v2 (broadcom) and i am getting a few errors on the logs related to igmp:

user.warn igmpproxy[1585]: MRT_DEL_MFC; Errno(2): No such file or directory
user.warn igmpproxy[1585]: No interfaces found for source 0.0.0.0
igmpproxy[2306]: select() failure; Errno(4): Interrupted system call

Any thoughts?

My HP printer has some connectivity problems with the same router and i read that printer uses multicast / bonjour / mdns settings to work.

Could this be the root cause?

JP
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