ppp(8) and inbound IP connections
Joe Holden
lists at rewt.org.uk
Tue May 7 18:43:59 UTC 2013
Matthias Apitz wrote:
>
> Hello,
>
> I'm using ppp(8) for many years to connect via UMTS to my service provider
> and Internet, actually www.fonic.de; all this works fine already for long
> time, works fine for outgoing TCP and UDP connections to Internet.
>
> Until now, I did not care about incoming TCP connections, for example for
> SSH'ing from remote to my netbook, connected via ppp(8), or for incoming
> SIP; it turns out now,, that I can:
>
> - check with "lynx -dump myip.nl | fgrep WAN" with which addr I show
> up in Internet:
>
> $ lynx -dump myip.nl | fgrep WAN
> WAN IP adres: 82.113.99.104
>
> - can SSH fine to some remote server,
>
> - but can not SSH back to the addr 82.113.99.104;
>
> I contacted the provider thinking that he is blocking all IP connects which
> have not been originated by a SYN pkg from my side; but he claims not
> blocking anything; and now? how can I debug this?
>
> My interface looks like this:
>
>
> tun6: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1500
> options=80000<LINKSTATE>
> inet 10.33.28.104 --> 10.64.64.64 netmask 0xffffffff
> nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
> Opened by PID 799
>
> and the routing is:
>
>
> Routing tables
>
> Internet:
> Destination Gateway Flags Refs Use Netif Expire
> default 10.64.64.64 UGS 0 1694 tun6
> 10.33.28.104 link#7 UHS 0 0 lo0
> 10.64.64.64 link#7 UHS 0 1 tun6
> 127.0.0.1 link#6 UH 0 75 lo0
>
> Any ideas about this? Thanks.
>
> I'm attaching the ppp.conf file.
>
> matthias
>
It seems quite clear from your ifconfig output that your provider
doesn't give you a routable address, so you will never see inbound
connections. Usually providers have an alternate APN that will give you
one, but that depends on the provider in question.
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