Francisco H Tapia
my.lists at verizon.net
Mon Nov 3 13:11:19 CST 2003
Jim, I'm replying to the dba-tech list as that is the proper list for this topic :). On that note, some of your more recent Switches also come w/ somthing called spanning trees. Jim Dettman wrote: >Drew/Erwin, > > One minor correction. Switches don't use NAT tables. They use MAC >Address lists and ARP tables. NAT is something done only in a router. > >Jim Dettman >President, >Online Computer Services of WNY, Inc. >(315) 699-3443 >jimdettman at earthlink.net > >-----Original Message----- >From: accessd-bounces at databaseadvisors.com >[mailto:accessd-bounces at databaseadvisors.com]On Behalf Of Drew Wutka >Sent: Monday, November 03, 2003 11:59 AM >To: 'Access Developers discussion and problem solving' >Subject: RE: [AccessD] OT: Wireless network (sort of) > > >Read Erwins post a little while ago, was waiting for your's before I >replied! <grin> > >Erwin, switches also use NAT tables. Because of this, they don't have to >broadcast everything in all directions. They're 'smart', when a packet >comes in, they can properly direct it. The downside to the NAT tables is >that if you blow the NAT table away, it has to be rebuilt, so sometimes on >an initial powerup, a switch may seem slower, which is simply the time it is >using to build the NAT tables. > >Drew > >-----Original Message----- >From: Frank Tanner III [mailto:pctech at mybellybutton.com] >Sent: Sunday, November 02, 2003 8:35 AM >To: Access Developers discussion and problem solving >Subject: RE: [AccessD] OT: Wireless network (sort of) > > >And they improve speed. > >Because they do not SHARE the bandwidth amongst the >ports. A 10-BaseT hub SHARES that speed amongst the >available ports. This dividing the individual >bandwidth per port. > >A switch allocates all available bandwidth on a PER >PORT basis. > >Maybe you need to learn what you are talking about >before you give out false information. > >--- Erwin Craps <Erwin.Craps at ithelps.be> wrote: > > >>And to be correct, switches don't improve speed >>(compared to hub's) they >>improve bandwith and reduce collisions!!! >>Switches create virtual point to point connections. >> >>Switches do improve speed compared to routers. >> >>Erwin >> >>-----Oorspronkelijk bericht----- >>Van: accessd-bounces at databaseadvisors.com >>[mailto:accessd-bounces at databaseadvisors.com] Namens >>Frank Tanner III >>Verzonden: zaterdag 1 november 2003 16:23 >>Aan: Access Developers discussion and problem >>solving >>Onderwerp: RE: [AccessD] OT: Wireless network (sort >>of) >> >> >>Switches will ALWAYS improve your speed over hubs. >>Period. >> >>Hubs SHARE the same bandwidth on all ports. >>Switches >>allocate the max bandwidth per port. >> >>You are incorrect. >> >>--- Erwin Craps <Erwin.Craps at ithelps.be> wrote: >> >> >>>But switches have no sense in a 1 server >>> >>> >>environment >> >> >>>because all of the >>>trafic goes and comes from one point. >>>Unless your clients are 100Mb and the uplink to >>> >>> >>the >> >> >>>server is 1Gb. >>> >>>People often believe switches will improve their >>>network speed, but that >>>is not always the case. >>>But indeed the prices of the switches have dropped >>>that you buy a switch >>>at the price of a good hub these days. >>> >>>Erwin >>> >>>-----Original Message----- >>>From: accessd-bounces at databaseadvisors.com >>>[mailto:accessd-bounces at databaseadvisors.com] On >>>Behalf Of Rocky Smolin >>>- Beach Access Software >>>Sent: Saturday, November 01, 2003 1:55 AM >>>To: Access Developers discussion and problem >>> >>> >>solving >> >> >>>Subject: Re: [AccessD] OT: Wireless network (sort >>>of) >>> >>> >>>Got it. I think. Switch can route packet based on >>>IP address but can't >>>generate an IP address. Yes? >>> >>>Rocky >>> >>> >>>Rocky >>> >>>----- Original Message ----- >>>From: "Frank Tanner III" >>> >>> >><pctech at mybellybutton.com> >> >> >>>To: "Access Developers discussion and problem >>>solving" >>><accessd at databaseadvisors.com> >>>Sent: Friday, October 31, 2003 10:29 AM >>>Subject: Re: [AccessD] OT: Wireless network (sort >>>of) >>> >>> >>> >>> >>>>It is sort of half-way, but not really. >>>> >>>>Switches are a "generation" better. Hubs and >>>>switches, on their most basic level perform the >>>> >>>> >>>same function. They >>> >>> >>>>distribute network traffic. But HOW they >>>> >>>> >>>distribute that traffic is >>> >>> >>>>fundimentally different. >>>> >>>>Unless they're one of the newer layer 3 or layer >>>> >>>> >>4 switches, they >> >> >>>>cannot perform routing functions. >>>> >>>> >>>They >>> >>> >>>>just hand packets off from point A to point B. >>>> >>>> >>>Think >>> >>> >>>>of them as sort of a postman. They have an >>>> >>>> >>>address >>> >>> >>>>for each device on the network and they hand off >>>> >>>> >>>each >>> >>> >>>>piece of mail to the appropriate address. A >>>> >>>> >>hub, >> >> >>>>using this sama analagy would deliver the same >>>> >>>> >>>piece >>> >>> >>>>of mail to every house and the one that it >>>> >>>> >>>belonged to >>> >>> >>>>would be the one that actually reads it. >>>> >>>>--- Rocky Smolin - Beach Access Software >>>> >>>> >><bchacc at san.rr.com> wrote: >> >> >>>>>"but it's as close as I could think of without >>>>>getting too technical." >>>>> >>>>>Thank you. Much appreciated. So a switch is >>>>> >>>>> >>>like >>> >>> >>>>>halfway between a hub and >>>>>a router? >>>>> >>>>>Rocky >>>>> >>>>>----- Original Message ----- >>>>>From: "Frank Tanner III" >>>>> >>>>> >>><pctech at mybellybutton.com> >>> >>> >>>>>To: "Access Developers discussion and problem >>>>>solving" >>>>><accessd at databaseadvisors.com> >>>>>Sent: Friday, October 31, 2003 7:36 AM >>>>>Subject: Re: [AccessD] OT: Wireless network >>>>> >>>>> >>>(sort >>> >>> >>>>>of) >>>>> >>>>> >>>>> >>>>> >>>>>>A router and a switch are fundimentall >>>>>> >>>>>> >>>different >>> >>> >>>>>>things. >>>>>> >>>>>>A router does just that. It routes network >>>>>> >>>>>> >>>>>traffic. >>>>> >>>>> >>>>>>A switch plays "traffic cop" for a network. >>>>>> >>>>>>Newer switches, especially the layer 3 and >>>>>> >>>>>> >>>layer 4 >>> >>> >>>>>>ones can perform both functions.This isn't >>>>>> >>>>>> >>an >> >> >>>>>exact >>>>> >>>>> >>>>>>definition, but it's as close as I could >>>>>> >>>>>> >>think >> >> >>>of >>> >>> >>>>>>without getting too technical. >>>>>> >>>>>>--- Rocky Smolin - Beach Access Software >>>>>> >>>>>> >>><bchacc at san.rr.com> >>> >>> >>>>>>wrote: >>>>>> >>>>>> >>>>>>>Is there a difference between a switch and >>>>>>> >>>>>>> >>a >> >> >>>>>router? >>>>> >>>>> >>>>>>>Rocky >>>>>>> >>>>>>>----- Original Message ----- >>>>>>>From: "Frank Tanner III" >>>>>>> >>>>>>> >>>>><pctech at mybellybutton.com> >>>>> >>>>> >>>>>>>To: "Access Developers discussion and >>>>>>> >>>>>>> >>>problem >>> >>> >>>>>>>solving" >>>>>>><accessd at databaseadvisors.com> >>>>>>>Sent: Friday, October 31, 2003 6:54 AM >>>>>>>Subject: RE: [AccessD] OT: Wireless >>>>>>> >>>>>>> >>network >> >> >>>>>(sort >>>>> >>>>> >>>>>>>of) >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>>>I recommend "hardwiring" the IP address >>>>>>>> >>>>>>>> >>of >> >> >>>any >>> >>> >>>>>>>device >>>>>>> >>>>>>> >>>>>>>>or server connected to your LAN that's >>>>>>>> >>>>>>>> >>not >> >> >>>a workstation and >>> >>> >>>>>>>>is virtually always on. >>>>>>>> >>>>>>>>For the price, I would also highly >>>>>>>> >>>>>>>> >>>recommend >>> >>> >>>>>>>removing >>>>>>> >>>>>>> >>>>>>>>all hubs from your network and using >>>>>>>> >>>>>>>> >>them >> >> >>>as doorstops. >>> >>> >>>>>>>>Switches have come way down in >>>>>>>> >>>>>>>> >>>>>price >>>>> >>>>> >>>>>>>and >>>>>>> >>>>>>> >>>>>>>>have many benifits over hubs. >>>>>>>> >>>>>>>>Hubs divide the bandwidth across all >>>>>>>> >>>>>>>> >>>ports. >>> >>> >>>>>Thus >>>>> >>>>> >>>>>>>if >>>>>>> >>>>>>> >>>>>>>>you have an 8-port 10-BaseT hub, all >>>>>>>> >>>>>>>> >>ports >> >> >>>>>that >>>>> >>>>> >>>>>>>are >>>>>>> >>>>>>> >>>>>>>>processing data split that 10Mbit. A >>>>>>>> >>>>>>>> >=== message truncated === > >_______________________________________________ >AccessD mailing list >AccessD at databaseadvisors.com >http://databaseadvisors.com/mailman/listinfo/accessd >Website: http://www.databaseadvisors.com >_______________________________________________ >AccessD mailing list >AccessD at databaseadvisors.com >http://databaseadvisors.com/mailman/listinfo/accessd >Website: http://www.databaseadvisors.com > > >_______________________________________________ >AccessD mailing list >AccessD at databaseadvisors.com >http://databaseadvisors.com/mailman/listinfo/accessd >Website: http://www.databaseadvisors.com > > > -- -Francisco