Date: Tue, 07 May 2013 19:43:30 +0100 From: Joe Holden <lists@rewt.org.uk> To: Matthias Apitz <guru@unixarea.de> Cc: freebsd-net@freebsd.org Subject: Re: ppp(8) and inbound IP connections Message-ID: <51894B52.2050903@rewt.org.uk> In-Reply-To: <20130507181345.GA992@tiny.Sisis.de> References: <20130507181345.GA992@tiny.Sisis.de>
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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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