Re: IP -> e-mail
El día Wednesday, June 06, 2012 a las 02:06:48AM -0700, Dánielisz László escribió: > Hi everybody, > > Let say my computer is connected to the internet with a cable modem and has a > dynamic IP address via DHCP. This address is refreshed after every random > days. > I want to know the new address even when I'm not home. Like send an e-mail > with the new IP, I already know how to do this, but how can I track the event > when my computer receives the new IP? > Any ideas or same issues? Hi, Run this in a cronjob: lynx -dump myip.nl | fgrep 'WAN IP' strore the result in a file and when it changes, trigger a mail; HIH matthias -- Matthias Apitz e - w http://www.unixarea.de/ UNIX since V7 on PDP-11, UNIX on mainframe since ESER 1055 (IBM /370) UNIX on x86 since SVR4.2 UnixWare 2.1.2, FreeBSD since 2.2.5 ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: IP -> e-mail
Matthias Apitz writes:
> > Let say my computer is connected to the internet with a cable
> modem and has a dynamic IP address via DHCP. This address is
> refreshed after every random days.
>
> > I want to know the new address even when I'm not home. Like
> send an e-mail with the new IP, I already know how to do this,
> but how can I track the event when my computer receives the new
> IP?
>
> Run this in a cronjob:
>
> lynx -dump myip.nl | fgrep 'WAN IP'
>
> strore the result in a file and when it changes, trigger a mail;
Or, using only tools in the base system:
ifconfig | head | grep "inet " | awk '{print $2}'
Robert Huff
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Re: IP -> e-mail
El día Wednesday, June 06, 2012 a las 09:17:47AM -0400, Robert Huff escribió:
> > Run this in a cronjob:
> >
> > lynx -dump myip.nl | fgrep 'WAN IP'
> >
> > strore the result in a file and when it changes, trigger a mail;
>
> Or, using only tools in the base system:
>
> ifconfig | head | grep "inet " | awk '{print $2}'
This will not work if your host has some private addr which is NAT'ed by a
router; the real test is ask some remote side "how I do apear to you?"
ofc you could do this as well by SSH'ing to some side and asking with
netstat(1) there (which may be shows another NAT'ed addr too :-))
Trust me, the above lynx is the nearly only robust version.
matthias
--
Matthias Apitz
e - w http://www.unixarea.de/
UNIX since V7 on PDP-11, UNIX on mainframe since ESER 1055 (IBM /370)
UNIX on x86 since SVR4.2 UnixWare 2.1.2, FreeBSD since 2.2.5
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Re: IP -> e-mail
m > From owner-freebsd-questi...@freebsd.org Wed Jun 6 07:37:57 2012 > Date: Wed, 6 Jun 2012 02:06:48 -0700 (PDT) > From: =?iso-8859-1?Q?D=E1nielisz_L=E1szl=F3?= > To: "freebsd-questions@freebsd.org" > Subject: IP -> e-mail > > Hi everybody, > > Let say my computer is connected to the internet with a cable modem and h > as a dynamic IP address via DHCP. This address is refreshed after every r > andom days. > I want to know the new address even when I'm not home. Like send an e-mai > l with the new IP, I already know how to do this, but how can I track the > event when my computer receives the new IP? > Any ideas or same issues? Schedule a 'cron' job to run as frequently as you like. Have it: a) do an 'ifconfig -a', or maybe just check the 'interface of interest'. b) 'diff' that output against a 'reference' copy from the previous run c) send an email if diff reports differences d) save the ifconfig output for referene in the next run ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
RE: IP -> e-mail
> -Original Message- > From: owner-freebsd-questi...@freebsd.org [mailto:owner-freebsd- > questi...@freebsd.org] On Behalf Of Robert Huff > Sent: Wednesday, June 06, 2012 9:18 AM > To: Matthias Apitz > Cc: freebsd-questions@freebsd.org > Subject: Re: IP -> e-mail > > > Matthias Apitz writes: > > > > Let say my computer is connected to the internet with a cable > > modem and has a dynamic IP address via DHCP. This address is > > refreshed after every random days. > > > > > I want to know the new address even when I'm not home. Like send > > an e-mail with the new IP, I already know how to do this, but how can > > I track the event when my computer receives the new IP? > > If you are using it so you know what IP to hit from outside your network, I would also recommend taking a look at a service like DynDNS as you would have a DNS name that would auto correct for new IP. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: IP -> e-mail
Matthias Apitz opined:
> El dia Wednesday, June 06, 2012 a las 09:17:47AM -0400, Robert Huff escribio:
> > Matthias Apitz opined:
> > >
> > > lynx -dump myip.nl | fgrep 'WAN IP'
> > >
> > > strore the result in a file and when it changes, trigger a mail;
> >
> > Or, using only tools in the base system:
> >
> > ifconfig | head | grep "inet " | awk '{print $2}'
>
> This will not work if your host has some private addr which is NAT'ed by a
> router;
FALSE TO FACT. Given the OP's actual request.
> the real test is ask some remote side "how I do apear to you?"
> ofc you could do this as well by SSH'ing to some side and asking with
> netstat(1) there (which may be shows another NAT'ed addr too :-))
Matthias, your lynx-based 'solution' does *NOT* solve the OP's question.
He wants to know -when- his DHCP assigned address changes. Consider
what happens if both the expired address and the new address are behind
the _same_ NAT translation. The internal addrress changes, but the
external one does not.
To do what the OP _asked_, parsing the 'ifconfig' output *is* the correct
approach.
_IF_, on the other hand, he wants to know when the 'externally visible'
address (a _very_ different question) for that host changes, then your
approach is the correct one.
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Re: IP -> e-mail
El día Wednesday, June 06, 2012 a las 10:03:26AM -0400, Sean Cavanaugh escribió: > > Matthias Apitz writes: > > > > > > Let say my computer is connected to the internet with a cable > > > modem and has a dynamic IP address via DHCP. This address is > > > refreshed after every random days. > > > > > > > I want to know the new address even when I'm not home. Like send > > > an e-mail with the new IP, I already know how to do this, but how can > > > I track the event when my computer receives the new IP? > > > > > If you are using it so you know what IP to hit from outside your network, I understand that the OP is not at home when the change occurs, but wants to connect to home; > I would also recommend taking a look at a service like DynDNS as you would > have a DNS name that would auto correct for new IP. the IP provider in Germany do not assign a static DNS name to you if yo do not have a static IP. matthias -- Matthias Apitz e - w http://www.unixarea.de/ UNIX since V7 on PDP-11, UNIX on mainframe since ESER 1055 (IBM /370) UNIX on x86 since SVR4.2 UnixWare 2.1.2, FreeBSD since 2.2.5 ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: IP -> e-mail
On Wed, 6 Jun 2012 02:06:48 -0700 (PDT) Dánielisz László wrote: > Hi everybody, > > Let say my computer is connected to the internet with a cable modem > and has a dynamic IP address via DHCP. This address is refreshed > after every random days. I want to know the new address even when I'm > not home. Like send an e-mail with the new IP, I already know how to > do this, but how can I track the event when my computer receives the > new IP? Any ideas or same issues? Have you considered dynamic dns? If you don't actually need the address it would allow you to access the machine by hostname. Even if you do, polling the dns is as good a way as any of detecting the change. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: IP -> e-mail
Dánielisz László writes: > Let say my computer is connected to the internet with a cable modem and has a > dynamic IP address via DHCP. This address is refreshed after every random > days. > I want to know the new address even when I'm not home. Like send an e-mail > with the new IP, I already know how to do this, but how can I track the event > when my computer receives the new IP? > Any ideas or same issues? dhclient-script(8) has provision for running scripts on any DHCP event, and provides both new and old IP addresses in environment variables. If they're different, fire off an e-mail. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: IP -> e-mail
El día Wednesday, June 06, 2012 a las 09:11:02AM -0500, Robert Bonomi escribió:
>
> Matthias Apitz opined:
> > El dia Wednesday, June 06, 2012 a las 09:17:47AM -0400, Robert Huff
> > escribio:
> > > Matthias Apitz opined:
> > > >
> > > > lynx -dump myip.nl | fgrep 'WAN IP'
> > > >
> > > > strore the result in a file and when it changes, trigger a mail;
> > >
> > > Or, using only tools in the base system:
> > >
> > > ifconfig | head | grep "inet " | awk '{print $2}'
> >
> > This will not work if your host has some private addr which is NAT'ed by a
> > router;
>
> FALSE TO FACT. Given the OP's actual request.
The OP request is a bit uncertain and I interpreted it as he wants to
know how to 'phone' home. The OP talks about a cable modem and DHCP and
about the addr for the computer. If your computer is connected to the
'modem' by ethernet or Wifi and the IP is assigned by DHCP to the modem,
you will never see any change in your computer. It just stays for ever,
for example, 192.168.2.1 while the router has 192.168.2.2 and all this
network is NAT behind the router WAN IP. In this szenario your ifconfig
solution will not help.
May be the OP should clarify his situation and what he really wants.
matthias
--
Matthias Apitz
e - w http://www.unixarea.de/
UNIX since V7 on PDP-11, UNIX on mainframe since ESER 1055 (IBM /370)
UNIX on x86 since SVR4.2 UnixWare 2.1.2, FreeBSD since 2.2.5
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RE: IP -> e-mail
> > > I would also recommend taking a look at a service like DynDNS as you > > would have a DNS name that would auto correct for new IP. > > the IP provider in Germany do not assign a static DNS name to you if yo do > not have a static IP. > Hence the Dynamic DNS option. Granted OP would have to run a client on their device to actively track the change but it would update the DNS record within a small window of the IP change. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: IP -> e-mail
On Wed, 06 Jun 2012 09:11:02 -0500, Robert Bonomi wrote: Matthias, your lynx-based 'solution' does *NOT* solve the OP's question. Incorrect; it does solve his problem. He wants to know -when- his DHCP assigned address changes. Consider what happens if both the expired address and the new address are behind the _same_ NAT translation. The internal addrress changes, but the external one does not. Please people, read carefully: His ISP is handing out his public IP via DHCP. This is normal for consumer internet connections. He doesn't care about his internal RFC 1918 IP which is handed out by his router's DHCP server; that's an easy problem to solve. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
