Showing posts with label icmp. Show all posts
Showing posts with label icmp. Show all posts

Tuesday, November 22, 2011

arping command

arping command is a very useful Linux command. It's purpose is to send ARP request on cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 local network and to print received responses. It's a sort like ping command, but it works on layer 2 (data link layer) instead on a network layer like ping. Unlike ping command you have to specify egress interface to this command since ocá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365rwise it doesn't know where to send request, and cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 command itself is programmed to send it to some predetermined interface, e.g. eth0.

Most frequently, you'll use it like this:
arping -I wlan0 192.168.1.1
which, in this particular case, tells arping command to send requests asking for a link layer address corresponding to IP address 192.168.1.1. Requests should go via wlan0 interface.

Now you may wonder what's so special about this command. Well, cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 special part is that cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365re is no way you can block it, unlike ping command. For example, Windows 7 by default blocks protocol packets used by ping command and thus you wont be able to check if host is alive using ping. With arping you can definitely determine if it is alive or not. But cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365re is a restriction, you can use it only on a local, Ecá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365rnet-like, network! So cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365re is no way it can be used over cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 network, at least not without some heavy tricks. Additional restriction is that you need administrative (root) privileges on a host, unlike ping command that can be run by any user.

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scientist, consultant, security specialist, networking guy, system administrator, philosopher ;)

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