ipv6 disabled but i'm getting an ipv6 address???

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Capslock118
DD-WRT Novice


Joined: 07 Aug 2007
Posts: 19
Location: New Haven, CT

PostPosted: Tue Dec 04, 2012 15:24    Post subject: ipv6 disabled but i'm getting an ipv6 address??? Reply with quote
i'm having issues with a protocol and it's related to ipv6.

the odd thing is that under administration -> management ipv6 is disabled, however, my client device is showing an ipv6 address:


Code:
eth0      Link encap:Ethernet  HWaddr B8:27:EB:EA:67:DB 
          inet addr:192.168.0.19  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::ba27:ebff:feea:67db/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:6519 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4895 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1956668 (1.8 MiB)  TX bytes:3253776 (3.1 MiB)



why?

i don't want ipv6, it needs to be disabled.

hint: the client is read-only system, i can't do much in the way of administration on that system, I need to disable ipv6 on the router side.
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crashfly
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Joined: 24 Feb 2009
Posts: 2026
Location: Sol System > Earth > USA > Arkansas

PostPosted: Tue Dec 04, 2012 15:50    Post subject: Reply with quote
You need to go read up on IPv6 and the addresses associated with it. Just like IPv4 has private non-internet routable addresses, IPv6 also has those. Those that start with fe80 are called local link addresses. Even if the router does not hand out IPv6 addresses, the computers and devices on the local network that support IPv6 can communicate with each other using that protocol (otherwise they usually default back to IPv4).

Try checking the DD-WRT wiki for IPv6 setup.
http://www.dd-wrt.com/wiki/index.php/IPv6

Edit: I just noticed you want IPv6 disabled. You are going to have to do that on the device. Not the router. Most modern OS's support IPv6 straight 'out of the box' with it turned on.

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iVitor
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Joined: 10 Jul 2009
Posts: 106

PostPosted: Tue Dec 04, 2012 16:04    Post subject: Reply with quote
That is a link-local address, which has nothing to do with your router but rather your machine configuration.
Do read about IPv6, the paradigm has shifted quite a bit from IPv4. (I am not trying to be condescending in any way, shape or form, it's just that in IPv6 -- unlike IPv4 -- you don't have just a single address for everything, there are multiple types of addresses, that coexist simultaneously in the same connection and have different purposes, being the most important part for this matter that they get configured through different ways).

If you have no control whatsoever over that machine then tough luck, that is the way it's going to be and there is nothing you can do about it. (Sorry if it sounds harsh but that is how it is).
Capslock118
DD-WRT Novice


Joined: 07 Aug 2007
Posts: 19
Location: New Haven, CT

PostPosted: Tue Dec 04, 2012 19:19    Post subject: Reply with quote
ah - local link address - that i get and no i don't see that response as harsh but informative.

i'm going to re-read the ipv6 docs you guys pointed me to; i've read them before and ipv6 just seems more confusing than it should be.

anyways, well the client I am referring to is openelec which is a read-only system. So if I'm out of luck because I have to change the client side but I can't do that, I guess this means I'll have to build from source and set it to disable ipv6.

thanks guys.
OrbitaLinx
DD-WRT Novice


Joined: 11 Dec 2022
Posts: 1

PostPosted: Sun Dec 11, 2022 12:17    Post subject: ipv6 Reply with quote
I also need ipv6 disabled. I set up my router so it wont retransmit any ipv6 traffic to secure my network because if its enabled on lan either data leaks threw the ipsec or equipment takes an ipv6 address and just gets stuck wihtout an internet connection. No one needs ipv6 on their lan unless their they have hundreds of devices... And even still you can use vlans and subnets. Also no one can remember ipv6 addresses so if you are doing a lot of cli things their just annoying...

Unfortunately I "upgraded" my old dd-wrt to a newer firmware and now I have a PC thats running an obscure cli interface that does not use a standard network manager and took an ipv6 address and now I cant access the oddly enough more fully featured gui web server to change the setting or get internet on that PC. And the new firmware has no ipv6 options at all. It doesn't even show me the addresses...
egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 12915
Location: Netherlands

PostPosted: Sun Dec 11, 2022 12:39    Post subject: Reply with quote
Then disable IPv6 on your PC.

A windows client has IPv6 enabled by default nowadays.
No big deal as all they have are link local addresses which are not routable.

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plawer
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Posts: 156

PostPosted: Mon Dec 12, 2022 2:39    Post subject: Reply with quote
I just want to chime in that I have seen weird IPV6 behavior on my WRT3200ACM.
https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=333382&postdays=0&postorder=asc&start=0

It is disabled on the router but is visible on the router interfaces through ifconfig in the terminal window. It is only this one router. My AP WRT3200ACM does not have any IPV6 addresses on any interface.

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egc
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Joined: 18 Mar 2014
Posts: 12915
Location: Netherlands

PostPosted: Mon Dec 12, 2022 14:27    Post subject: Reply with quote
plawer wrote:
I just want to chime in that I have seen weird IPV6 behavior on my WRT3200ACM.
https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=333382&postdays=0&postorder=asc&start=0

It is disabled on the router but is visible on the router interfaces through ifconfig in the terminal window. It is only this one router. My AP WRT3200ACM does not have any IPV6 addresses on any interface.


Probably also a link-local address (fe80:: ), which has no consequences.

I think these addresses are generated if module ipv6 is loaded (from CLI: lsmod)
That module can be loaded if you are using WireGuard, WireGuard is IPv6 aware Smile

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Routers:Netgear R7000, R6400v1, R6400v2, EA6900 (XvortexCFE), E2000, E1200v1, WRT54GS v1.
Install guide R6400v2, R6700v3,XR300:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
Install guide R7800/XR500: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
Forum Guide Lines (important read):https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087
plawer
DD-WRT User


Joined: 11 Aug 2019
Posts: 156

PostPosted: Mon Dec 12, 2022 18:28    Post subject: Reply with quote
That's it. The other router with Wireguard also has IPV6 addresses. Thanks for the explanation.
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