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

[Tom Storey]

Is the PPP session dropping by any chance? I think I had something
like this a year or two ago and it turned out to be a buggy JunOS
version, I had to roll back to a previous version.

I have successfully brought up a he.net tunnel with an SRX110, so its
definitely possible and there should be no unexpected behaviour when
everything is running fine.

On 1 February 2016 at 06:05, 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
>
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