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What arp -s is good for

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The Lounge War Stories What arp -s is good for
# 1  
Old 10-24-2012
Quote:
Originally Posted by Neo
a ping to a broadcast address should be done on the same subnet as the broadcast address, as a general rule.
True - still, this works only if network (the department, not the device) hasn't decided that every network connection, even one on the same subnet, has to go over a switch with firewall capabilities enabled (that is: each and every port blocked per default).

In my last project i had such a network, which is truly a PITA: you won't even get a ping from your default gateway back - but should manage HA-networks over that crap. Usually it took us 2-3 weeks to set up a cluster - 1 hour for installing and configuring it, the rest for filling out the forms required to get the various necessary ports opened in the firewall (which never worked right the first time).

bakunin
Last edited by bakunin; 10-24-2012 at 05:56 PM..
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LEARN ABOUT DEBIAN

edsc

EDSC(4) 						   BSD Kernel Interfaces Manual 						   EDSC(4)

NAME

     edsc -- Ethernet discard network interface

SYNOPSIS

     device edsc

DESCRIPTION

     The edsc interface is a software discard mechanism which may be used for performance analysis and software testing.  It imitates an Ethernet
     device, which allows for its use in conjunction with such drivers as if_bridge(4) and vlan(4).

     As with other network interfaces, an edsc interface must have network addresses assigned for each address family with which it is to be used.
     These addresses may be set or changed with the SIOCSIFADDR ioctl(2) or ifconfig(8) utility.

     Each edsc interface is created at runtime using interface cloning.  This is most easily done with the ifconfig(8) create command or using the
     cloned_interfaces variable in rc.conf(5).

SEE ALSO

     ioctl(2), arp(4), if_bridge(4), inet(4), intro(4), vlan(4), rc.conf(5), arp(8), ifconfig(8)

HISTORY

     The edsc device was derived from the disc(4) device and first appeared in FreeBSD 6.3.  This manpage was adapted from disc(4).

CAVEATS

     Since outgoing packets are just discarded by edsc, ARP requests stay unreplied.  Consequently, an IP packet cannot be sent via edsc until a
     static arp(4) entry is created for its next hop using arp(8).

     Initially an edsc interface has a zero link level address.  It can be changed with ifconfig(8) lladdr if needed.

BSD
								  March 25, 2007							       BSD