Date: Tue, 23 Jan 2001 17:43:50 -0500 From: "Patrick Bihan-Faou" <patrick@netzuno.com> To: <freebsd-net@freebsd.org> Subject: How to send arp request with no other traffic Message-ID: <HJEEKLMFLKEOKHOKNPBMEEDACJAA.patrick@netzuno.com>
next in thread | raw e-mail | index | archive | help
Hi, How could I perform a arp resolution without attempting to send traffic to the IP address I am looking up ? To rephrase my question, if I use arp(8), to obtain the mac address associated with a specific IP address and that information is not yet in the arp cache, arp(8) returns: bash-2.03$ arp 192.168.10.208 192.168.10.208 (192.168.10.208) -- no entry so to obtain the information I want, I need to first do a ping: bash-2.03$ ping -c 1 192.168.10.208 PING 192.168.10.208 (192.168.10.208): 56 data bytes 64 bytes from 192.168.10.208: icmp_seq=0 ttl=255 time=0.355 ms --- 192.168.10.208 ping statistics --- 1 packets transmitted, 1 packets received, 0% packet loss round-trip min/avg/max/stddev = 0.355/0.355/0.355/0.000 ms bash-2.03$ arp 192.168.10.208 ? (192.168.10.208) at 0:90:27:a7:6a:e0 [ethernet] While this is not a major concern, it would be nice if it was possible to trigger the arp lookup directly without using another command. Maybe with a special switch to the arp(8) command: bash-2.03$ arp -q 192.168.10.208 ? (192.168.10.208) at 0:90:27:a7:6a:e0 [ethernet] Can anybody give me a hint on how I could implement that option ? Patrick. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?HJEEKLMFLKEOKHOKNPBMEEDACJAA.patrick>