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Wamparythm's profile
Wamparythm
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New Member

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18 Messages

Sat, May 1, 2021 3:59 AM

What is Br6 and why is it broadcasting?

pm_hm_ac_if

Dependency State: UP
Link State: UP
Link Detail: UP

Timeout: 0
File Descriptor flags: 00000000
Reported error string:
File Descriptor State: Count: 1 Active: 1 Events: 3

Module State Change History:
  To State DOWN at 00:01:30.73

ipnet6 state: UP parent dev: br6
flags:  NONROUTE
Address: 203.0.113.1/29, broadcast: 203.0.113.7, gateway: 0.0.0.0
DNS servers: (none)
NBNS servers: (none)
NTP servers: (none)
DNS domain: 
NBT scope: 
NBT node type: B
Multicast Proxy: DISABLED
MTU: 1500
JefferMC

ACE - Expert

 • 

29.3K Messages

1年前

Looks like a multicast VLAN to me.

Wamparythm

New Member

 • 

18 Messages

1年前

That is what I thought. It seems to be going through a different router than the one in my 5628ac AT&T gateway. But I don’t have one. How do I stop this? What do I do?

JefferMC

ACE - Expert

 • 

29.3K Messages

1年前

You have U-verse TV and a WAP?

Wamparythm

New Member

 • 

18 Messages

1年前

Yes. But Br0, Br1, Br2, Br6 are all enabled and running at times.

(edited)

JefferMC

ACE - Expert

 • 

29.3K Messages

1年前

So?

Wamparythm

New Member

 • 

18 Messages

1年前

There are more than what Uverse requires. And some of the subsets are not ATT’s MO.

showergel

Teacher

 • 

15 Messages

2分前

This may be a few years late, but this network exists solely for the purpose of documenation, per the IETF (https://www.rfc-editor.org/rfc/rfc5737.html).  

Basically, if I was writing a document and wanted to use a public IP space in that documentation, but didn't want to refer to a public IP network that is actually in use (think of how bad that might be for the IP block owner), then this is one of those 3 networks that should be used.

IANA recommendations for this space 203.0.113.0/24, is for ISPs to add the network to a non-routable space so those IPs it cannot be used within their network.  It seems AT&T hasn't sufficiently blocked that entire /24 space of this network, instead they blocked only /29 of it.  The other two networks in the RFC are not in the AT&T gateway config at all.  Perhaps the larger set of IP blocking occurs downstream from the gateway, but I cannot confirm that.

Lastly, someone would need to own the IP block, even if it was designated as unusable.  AsiaPAC happens to be the owner of this non-routable public IP block.

Either way the network on br6 is set to NONROUTE so it conforms more or less, to the IETF RFC, even if it's not entirely compliant at the AT&T Gateway level.  

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