speaking of tcp/ip illustrated there is a zipped up html version online (free) from a college site if you do a google search for it -
Hope that helps- --- Jim Sandoz <[EMAIL PROTECTED]> wrote: > > Fu, > > > Does this means that a multi-homed FreeBSD will > start to > > route packets on its connected network if its > NICs were > > in promiscues mode? I don't believe so. I think > only the > > BPF devices are affected, not ip_input. > > if the host is acting as a router, ethernet frames > (which > are carrying ip packets) will be addressed to the > host. > so there is no need for the NIC to be in promiscuous > mode > in order for the host to act as a router. consider > that > a single host to host connection (over a series of > subnets) > is made up of a collection of conversations between > routers > (at the ethernet "layer"). so while there are just > two IP > addresses involved with your ICMP ping message > packet to > moon-base-alpha.moon.com, there are dozens of mac > addresses > involved as the packet hops through various subnets. > > see the output of > $ man arp > and get yourself a copy of TCP/IP Illustrated (W.R. > Stevens) > > there is some more info for you here > http://marc.theaimsgroup.com/?l=ipfilter&m=98944765022022&w=2 > > but... <<< naming police warning >>> > > please don't confuse a multi-homed host with a > router. > the latter is sometimes also referred to as a > gateway. > > a multi-homed host does not necessarily route; it is > in > fact perfectly acceptable for a host to sit on N > networks > and not pass traffic between then networks. this i > think > is the proper definition of multi-homed. in this > case a > multi-homed host NEVER forwards packets between > interfaces. > > see also > http://marc.theaimsgroup.com/?l=ipfilter&m=98927129912996&w=2 > > a router/routing host, in contrast, accepts packets > and > does one of three things with them: > 1) forwards them out another interface based on a > routing table. > 2) determines that they are for the "local" host. > 3) drops them. this could be due to a routing > configuration > error on nearby hosts. > > jim > > > Fu Ming wrote: > > ----- Original Message ----- > > From: "Remco Post" <[EMAIL PROTECTED]> > > To: <[EMAIL PROTECTED]> > > Sent: Friday, June 06, 2003 4:15 AM > > Subject: Re: where the ip packet is discarded? > > > >>On 6 Jun 2003 09:26:00 +0800 > >>"forge" <[EMAIL PROTECTED]> wrote: > >> > >> > >>>Hello, everyone > >>> > >>>I have a hub and several computers connected to > it, e.g. > >>> > >>> HUB > >>> |----B > >>>A ---| > >>> | > >>> |----C > > ===== SRR __________________________________ Do you Yahoo!? Yahoo! Calendar - Free online calendar with sync to Outlook(TM). http://calendar.yahoo.com
