Author Topic: 224.0.0.1 / Allow or Block?  (Read 9026 times)

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224.0.0.1 / Allow or Block?
« on: January 16, 2007, 04:26:35 PM »
I am finding a lot of IGMP inbound violations from 224.0.0.1

Should I allow it?

Offline Bubu74

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Re: 224.0.0.1 / Allow or Block?
« Reply #1 on: January 16, 2007, 05:23:30 PM »
I also have some IGMP trafifc from the same address, it is used for comunication between the router and all the other computers in the same network. I've made a rule to allow it, but I only have outbound, not inbound.
I would probably allow it, but I'm not 100% sure. Maybe you should wait for someone more experienced to answer  :)
COMODO user since January 2007

Offline Little Mac

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Re: 224.0.0.1 / Allow or Block?
« Reply #2 on: January 16, 2007, 05:34:29 PM »
Many Windows processes/services, along with various applications use IGMP to communicate.  By default, CPF's rules do not explicitly allow it.

Here's my take on that, as with any type of traffic (IP Protocol).  If you don't need it, why allow it?  We are all aware that Windows has plenty of security holes/issues, and since these things happen in the background (without the user's specific knowledge or consent), this could be a security issue.

That does not mean that it is a security issue; just that it could be, as you don't specifically know what the communication entails.  If your applications are working without problem, then what's the point in allowing it.  If you have a problem with connecting, or with an application connecting, and the logs (and research into that application) seem to indicate that the Protocol is needed, then you can create a specific network rule to allow that, so that the application can communicate.

Hope that helps,

LM
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Offline AOwL

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Re: 224.0.0.1 / Allow or Block?
« Reply #3 on: January 16, 2007, 06:01:47 PM »
I have a rule for it.
It looks like this.
It is in my network.

Action : Allow
Protocol : IP
Direction : In
Source IP : Zone
Destination IP : 224.0.0.1
IP Detail : IGMP

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Re: 224.0.0.1 / Allow or Block?
« Reply #4 on: January 16, 2007, 06:21:17 PM »
Why did you choose "zone"?

Offline AOwL

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Re: 224.0.0.1 / Allow or Block?
« Reply #5 on: January 16, 2007, 06:32:27 PM »
I have a router and then you should make a trusted network.
For me, it's all internal in my network zone, because it's the router that sends out these IGMP alerts.
It's necessary if you want to use streaming audio/video.
I have a setting in my router, so I can turn the IGMP off if i want.

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Re: 224.0.0.1 / Allow or Block?
« Reply #6 on: January 16, 2007, 06:36:13 PM »
Ok, so you have another computer, which you may want to allow IGMP?

Offline AOwL

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Re: 224.0.0.1 / Allow or Block?
« Reply #7 on: January 16, 2007, 06:45:23 PM »
Yes, there is 4 computers in my network.
Do you use a router?

Offline hilmi

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Re: 224.0.0.1 / Allow or Block?
« Reply #8 on: January 16, 2007, 07:07:04 PM »
Hi guys,
My log is full of this message as well.

Desc: Inbound Policy Violation (Access Denied, Protocol=IGMP)
Protocol: IGMP Incoming
Source: 10.49.160.1
Destination:224.0.0.1
Reason=Network Control Rule ID=5

The source and destination are always exactly the same as above. I get that logged  every minute.
I have a single computer connected to internet via ethernet adapter thru a cable modem.
This does not stop me any application running (so far) so it did not worry me. But my log is being filled up with this. If it is not necessary, is there a way to stop this logging.

Aowl mentioned that it is necessary for streaming audio/video. Is there any way for me to test that?
I can watch live tv shows or movie trailers from realplay site, etc. Is that what you mean by streaming video? Pardon my ignorance again.

Thanks
Hilmi
XP Pro SP2, cable modem, Nod32, SpyWall, COMODO

Offline AOwL

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Re: 224.0.0.1 / Allow or Block?
« Reply #9 on: January 16, 2007, 07:12:18 PM »
I meant streaming on my network.
Sometimes I've heard that it's needed for msn messenger and some other Windows apps, but you can try to make the rule I made in a previous post, and change it to block. Put "Any" where I wrote zone. Put the rule right above the default block rule.
I you get problems with something just put allow in it, and see if it works.

Offline Little Mac

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Re: 224.0.0.1 / Allow or Block?
« Reply #10 on: January 16, 2007, 07:27:45 PM »
When you make the block rule that AOwl mentioned, do not check the box "Create an alert..." that way it won't log the rule's activity.

LM
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Offline hilmi

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Re: 224.0.0.1 / Allow or Block?
« Reply #11 on: January 16, 2007, 09:59:42 PM »
Just to make sure what I've done is correct, this is the rule I created:
Block Ip In Any 224.0.0.1 IGMP.
Unchecked the show alerts from this rule.
Now it is still blocking and not logging any events for this event.
(It is the 5th rule now in the default rules as I have not created or editted any rules)

As I understand, we put this rule only to be able to stop logging the alert from this event. Is that correct?

Thanks

P.S.  As I am new to firewalls and would like to learn and understand it, I may have more questions to ask regarding logs, connections or how it works in general. Is there a common topic for this? I do not want to create a new topic for every question I may have. I try searching firstly but sometimes it takes a while to find what you really want.

I really enjoy CPF and the support from the forums. It's great and keep it up Guys.

Hilmi
XP Pro SP2, cable modem, Nod32, SpyWall, COMODO

Offline Little Mac

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Re: 224.0.0.1 / Allow or Block?
« Reply #12 on: January 17, 2007, 12:10:05 PM »

(It is the 5th rule now in the default rules as I have not created or editted any rules)

As I understand, we put this rule only to be able to stop logging the alert from this event. Is that correct?

P.S.  As I am new to firewalls and would like to learn and understand it, I may have more questions to ask regarding logs, connections or how it works in general. Is there a common topic for this? I do not want to create a new topic for every question I may have. I try searching firstly but sometimes it takes a while to find what you really want.


Hilmi,

First, with the addition of that rule, you should have a total of seven network rules.  The default rules created by an Automatic installation will number from Rule ID 0 to Rule ID 5 (thus, six rules).  Here's a link that gives all the basic network rule setups:  http://forums.comodo.com/index.php/topic,5340.0.html

Here's one on understanding and creating network rules (I highly recommend this one):  http://forums.comodo.com/index.php/topic,1125.0.html.  This was written initially for an older version of CPF; some of the language is different, but the theory is the same.

Here's one to help understand how the rule structure in CPF works (Network, Application, Component):  http://forums.comodo.com/index.php/topic,5372.0.html

Second, yes, the addition of that rule is simply to block the IGMP traffic before it gets to the bottom Block & Log rule (it should be above that bottom block rule).  By not setting this new rule to Log, you can keep the activity log from being filled up with all those entries relating to blocked IGMP.

Third, yes there is a recommended place to start.  It's right here:  http://forums.comodo.com/index.php/topic,894.0.html  This is the compiled "FAQ" page of common issues, with subjects and links to topics addressing those issues.  If you have a question, chances are good you will find an answer here.  If you need clarification, just post a question on the relevant thread.  (Note:  the three links I provided above all come from within this page).

This is within the overall FAQ section of the firewall forum, here:  http://forums.comodo.com/index.php/board,32.0.html

Hope that helps you.

LM
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Offline hilmi

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Re: 224.0.0.1 / Allow or Block?
« Reply #13 on: January 17, 2007, 07:46:49 PM »
Thanks LM.
Bother you again soon!!!!!!

Hilmi
XP Pro SP2, cable modem, Nod32, SpyWall, COMODO

 

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