[AusNOG] Can't bring up 6in4 tunnel (IPv6) because public IP changing on Optus ADSL

[Goran Aleksic]

Thanks Mark,

interesting one, the change of WAN IP happened during "commit" command.

Trace files I collected are overly verbose. I can only see that something
provoked re-negotiation of it.

Interestingly enough, a trivial configuration change (added description to
ip-0/0/0 interface) and commit after that triggered another WAN IP change...



On 2 February 2016 at 13:25, Diogo Montagner <diogo.montagner at gmail.com>
wrote:

> Try to find out why the address is changing when the tunnel comes up.
>
> Try enabling few traceoptions.
>
> Below are few suggestions:
>
> [edit]
> dmontagner at vmx# show | compare
> [edit]
> +  routing-options {
> +      traceoptions {
> +          file routing-optinos-trace;
> +          flag all;
> +      }
> +      resolution {
> +          traceoptions {
> +              file resolution;
> +              flag all;
> +          }
> +      }
> +  }
> +  protocols {
> +      pppoe {
> +          traceoptions {
> +              file pppoe-trace;
> +              level all;
> +              flag all;
> +          }
> +      }
> +  }
>
> [edit]
> dmontagner at vmx#
>
> Another thing you can do is:
>
> - via another session, do a monitor traffic interface at-x/0/0 size 1500
> no-resolve extensive
>
> This will show you the PPPoE packets (PADI, PADS, PADT and PADO) exchanged
> for the change in the IP address.
>
> ./diogo -montagner
> JNCIE-SP 0x41A
>
> On Tue, Feb 2, 2016 at 10:56 AM, Goran Aleksic <goran.aleksic at gmail.com>
> wrote:
>
>> Hi Diogo,
>>
>> many thanks. I was suspecting this should work, but seemed to deplete my
>> options reading forums...
>>
>>
>> Cheers,
>>
>> Goran
>>
>>
>> On 2 February 2016 at 02:47, Diogo Montagner <diogo.montagner at gmail.com>
>> wrote:
>>
>>> Hi Goran,
>>>
>>> This works fine. I have the same setup at home.
>>>
>>> I will send you my conf tomorrow with some additional troubleshooting
>>> stuff.
>>>
>>> Thanks
>>>
>>>
>>> On Monday, 1 February 2016, Goran Aleksic <goran.aleksic at gmail.com>
>>> wrote:
>>>
>>>> HI all,
>>>>
>>>> I've got Optus ADSL and dynamic public IP.
>>>> Needed 6-in-4 tunnel (IPv6 encapsulated into IPv4 tunnel), tried using
>>>> Hurricane Electric IPv6 provider, as I saw positive reviews.
>>>> I got Juniper SRX 110 modem and have implemented configuration as
>>>> stated on
>>>> http://forums.juniper.net/t5/SRX-Services-Gateway/HE-IPv6-tunnel-with-flow-based-IPv6-in-10-4/td-p/69338/highlight/true/page/3
>>>>
>>>> Issue is – my public IP (on at-1/0/0.0 interface) keeps changing every
>>>> time I attempt the tunnel.
>>>> This is a twofold problem:
>>>> 1. on Hurricane Electric page, you need to specify one endpoint of the
>>>> tunnel, i.e. your public IP
>>>> 2. In configuration of ip-0/0/0.0 interface (tunnel interface) on
>>>> Juniper SRX, you need to specify your tunnel source IP (a public IP). There
>>>> doesn't seem to be a trick like with Cisco, to use ip unnumbered and imply
>>>> IP address from your WAN interface...
>>>>
>>>> Why would an attempt to establish a IPv4 tunnel to another host trigger
>>>> my public IP to be changed?
>>>>
>>>> I'm wondering if anyone has experienced the same or similar issue?
>>>>
>>>> Thanks,
>>>>
>>>> Alex
>>>>
>>>
>>>
>>> --
>>> ./diogo -montagner
>>> JNCIE-SP 0x41A
>>>
>>
>>
>
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