On Tue 29 May 2018 at 08:04:06 (-0400), Alan Greenberger wrote: > On 2018-05-28, David Wright <deb...@lionunicorn.co.uk> wrote: > > On Mon 28 May 2018 at 07:54:49 (-0400), Alan Greenberger wrote: > >> On 2018-05-26, Pascal Hambourg <pas...@plouf.fr.eu.org> wrote: > >> > Le 25/05/2018 à 02:17, Alan Greenberger a écrit : > >> >> On 2018-05-24, André Rodier <an...@rodier.me> wrote: > >> >>> > >> >>> I am looking for a native package on Debian, that can give me the > >> >>> external IP address of the machine. > >> >> > >> >> Assuming you are looking for the public internet address of your router, > >> >> you could try: > >> >> /usr/sbin/arp -n > >> >> and it may show up on a line with the HWadress of your router. > >> > > >> > Nope. That would just show the internal address of the router. > >> > > >> > > >> You are mostly correct. However, I have one machine on which the > >> response to > >> /usr/sbin/arp -n > >> shows two lines with the HWaddress of the router, one with the internal > >> address as you said and the other with the external address. I have no > >> idea what made arp see the external address. > > > > Can we see what you're seeing (suitably mangled)? > > > > Cheers, > > David. > > > > > 192.168.1.1 ether 6x:3x:ex:7x:4x:bx C > eth0 > 2x.1xx.1xx.1xx ether 6x:3x:ex:7x:4x:bx C > eth0
The easiest way to achieve this might be to plug that host's cable into the modem rather than the router (for just a short period). I don't know how long it takes for arp entries to expire. A more worrying alternative is that something is misconfigured in the router, but I don't know what. Cheers, David.
