Date: Mon, 4 Dec 2006 17:42:23 +0200 From: a@zeos.net To: freebsd-questions@freebsd.org Subject: Re: How does my computer work with an empty arp table? Message-ID: <20061204154222.GA636@host.my.domain> In-Reply-To: <44ejrfptqh.fsf@be-well.ilk.org> References: <20061203174849.GA4561@host.my.domain> <44ejrfptqh.fsf@be-well.ilk.org>
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On Mon, Dec 04, 2006 at 10:26:46AM -0500, Lowell Gilbert wrote: > a@zeos.net writes: > > > My computer is connected to ISP via ADSL and works properly. > > > > I typed > > > > arp -a > > > > and saw an empty table, although I pinged successfully an Internet host > > one second ago. > > > > How does it work? > > > > ------------------------------------------------------------ > > > > $ ifconfig > > rl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 > > options=8<VLAN_MTU> > > inet6 fe80::202:44ff:fe92:1875%rl0 prefixlen 64 scopeid 0x1 > > inet 192.168.1.2 netmask 0xffffff00 broadcast 192.168.1.255 > > ether 00:02:44:92:18:75 > > media: Ethernet autoselect (100baseTX <full-duplex>) > > status: active > > lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384 > > inet6 ::1 prefixlen 128 > > inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2 > > inet 127.0.0.1 netmask 0xff000000 > > ng0: flags=88d1<UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST> mtu 1492 > > inet6 fe80::202:44ff:fe92:1875%ng0 prefixlen 64 scopeid 0x3 > > inet 91.124.65.146 --> 195.5.5.161 netmask 0xffffffff > > Maybe you are connected to your service provider by PPP-over-Ethernet? > In that case, the PPP link (which doesn't need ARP) is your next-hop > to the Internet, rather than the modem on the Ethernet link. Yes, you are right, I forgot about PPP. Many thanks.
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