- jvd wrote: > > OT: > hi, i just have to say that i will never try to answer anything > on this forum again. :-)
Well, would that be Grumpy, Bashful, Sleepy, or Dopey to do that? :-) Seriously, you should keep answering. You have sent some great answers, but you don't want to keep insisting something when replying to my messages. It makes me very Grumpy and I'm not Bashful when wielding a keyboard (just in person). I know lots of books claim that NetBIOS isn't routable, but I bet those exact same books also classify it as a session-layer protocol. And it does make a good example of a session-layer protocol. One of the few that we have! And if it runs at that layer, then it is routable. I think even IBM said it was a session-layer protocol in some of their early documents, which unfortunately, I recently tossed. Directed broadcasts came from out of the blue. I really don't think Windows networking uses them, although maybe it does. Was the comment maybe in reference to the helper address suggestion that I made? You can tell a router to send the packets when "it helps" as a broadcast. That's not a directed broadcast, though, and will work even if router forwarding of directed broadcasts is disabled, which is the default these days. Instead, it's a broadcast sent by the router (it has the router's IP address as source, on behalf of some other station, to a local LAN, because the router is acting as a proxy, for example, a DHCP Relay Agent.) Was that a run-on sentence, or what? :-) A directed broadcast is directed from afar into a subnet. The sender usually makes classful assumptions, since it can't actually know the local definition of a broadcast. It's used by ping scan to send a ping to 172.16.255.255, for example, in an attempt to ping everyone on network 172.16.0.0. Routers don't forward those these days because of the security risks. Back to NetBIOS. It does send a lot of broadcast traffic for naming purposes. In an IP environment, however, a host can be configured to send unicast naming queries and name registrations to a WINS server. There are probably lots of other issues, though. It really can be quite a pain to get it to work correctly when you migrate from a small LAN to a larger internetwork with WANs, subnetting, VLANs, etc. I wonder what the original poster is really trying to do and where he can get a good Windows networking (internetworking) design guide. Cisco used to have one, but it's probably way dated now.... Well, it's late and my writing is deteriorating. Howard covers directed broadcasts, by the way, (and a much better description of the OSI model, without reference to the dwarves, as I recall, although possibly with reference to the deadly sins) in his CertificationZone papers. I recommend them. Priscilla > > once i tried to answer a question with regards to bgp and a > 1720 router and only after howard helped us out was it clear > that the processor does play an important role. ;-) > > this time only after the input from priscilla is everybody > happy about the netbios/netbeui issue. ;-) > > but then i think what is important is that we dig a bit deeper > into some topics! > > Good work! > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=71203&t=71084 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
