Re: Question on Network Security
- From: responder <no@xxxxxxxxxxxx>
- Date: Wed, 14 Feb 2007 17:41:53 -0500
axsmth wrote:
Hi,
This is an end-of-chapter question in Comers book "Explain how sending IP
packets to nonexistent addresses on a remote Ethernet can generate
broadcast traffic on that n/w"
As I understand, only one broadcast will be sent out by the router. And
since it does not get a reply, it will drop the packet and send an ICMP
error packet to the original sender.
Is this correct? And suppose all machines on the Ethernet are directly
connected to the Internet, does that change how this works? Thanks
Think what you wrote is fundamentally correct, except that repeat packet
traffic is possible under some circumstances. If the described router
does *not* send an ICMP error packet to the original sender as it is
supposed to do (some do not), then several retries are not uncommon.
ARP is part of DHCP so ARP broadcast traffic only happens on DHCP
networks. Even if an interface effectively has a static IP address, if
that address is assigned under DHCP, then there usually is ARP broadcast
traffic on the local n/w. Exception to this is that ARP tables can be
manually configured.
.
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