Vicuna, Mark wrote: > > It will be the all 1's bit for that subnet eg. for > 192.168.1.224/27 it > would be 192.168.1.255 and for 192.168.1.32/27 it would be > 192.168.1.63.
I think he was asking how would you send to all the subnets. And the answer is, you wouldn't. Why would you want to do such a thing? I can't think of any legitimate application that needs to do that. It's alwasy been a fuzzy area. I know there have been rumors for years that if you use the all ones subnet it will confuse routers into thinking that they should send to all the subnets, but I've never seen that actually happen. Priscilla > > > HTH, > Mark. > > -----Original Message----- > From: Wesley [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, 17 July 2002 6:21 PM > To: [EMAIL PROTECTED] > Subject: Re: Broadcasting and the all ones subnet [7:48996] > > > Then how would you define an all /27 subnets broadcast i.e. not > just > 192.168.1.224 subnet getting the broadcast but all subnets? > Thank you > for > the reply BTW. > > ""Vicuna, Mark"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > Hi Wesley, > > > > a) correct > > > > b) no, as 192.168.1.32/27, 192.168.1.64/27 and > > 192.168.1.96/27 are on a different subnet to the broadcast > 192.168.1.255 > > (this is for the 192.168.1.224/27 subnet). > > > > c) from the answer to b), no. Only hosts on the > 192.168.1.224/27 > subnet > > will see the broadcast packet of 192.168.1.225. > > > > > > HTH, > > Mark. > > -----Original Message----- > > From: Wesley [mailto:[EMAIL PROTECTED]] > > Sent: Wednesday, 17 July 2002 16:49 > > To: [EMAIL PROTECTED] > > Subject: Broadcasting and the all ones subnet [7:48996] > > > > > > Hello Group, > > > > Three things to confirm about broadcasts. > > > > a) the all ones broadcast i.e 255.255.255.255 by default will > only be > > propagated to the local network and is not forwarded by > routers > > > > b) network and subnet directed broadcasts. If I were to > broadcast to > > 192.168.1.255, and I have subnets 192.168.1.32/27, > 192.168.1.64/27 and > > 192.168.1.96/27, would all the subnets receive it as well? > > > > c) referring to scenario b), I believe that broadcasts with > destination > > 192.168.1.255 is forwarded. Is this true? > > > > I was going thru this article about the effect of using the > all ones > > subnet. > > There are somethings that I'm still confused about. The link > is > > > > http://www.cisco.com/warp/public/105/40.html > > > > 1. In the first example, when host 195.1.1.24 sends a local > broadcast > to > > 195.1.1.255, will hosts attached to router 2's async lines > receive the > > broadcast? > > > > 2. OK, its a directed broadcast and router 2 looks up its > routing > table > > and > > forwards it out using the default route. Router 1 receives > the packet. > I > > believe the packet is forwarded out to all 192.1.1.x/26 > subnets, > right? > > Will > > Router 1 forward the packet back to Router 2? I hope not > > > > 2a. Another way of looking at it is router 1 thinks that it > is a > > broadcast > > only for subnet 195.1.1.192 and forwards it out only to > router 5. > Hmmm > > .... > > I'm definitely confused > > > > 3. Router 5 receives the packet from router 1. How will it > interpret > the > > packet? I'm guessing that the router sees it as a directed > broadcast > and > > send it out via the default route. Is it normal that routers > forward a > > packet out from an interface that it received on? As in its > received > on > > e0 > > and forwarded out e0 as well > > > > 4. Once router 1 receives the packet from router 5, will it > forward > the > > packet out to all 192.1.1.x/26 subnets again or just to > router 5. The > > article did not detail this part and just specified that it > will > bounce > > between routers 1 and 5. It also says that routers 2 thru 4 > see the > > 'broadcast' only once. The way I see it , if all subnets > receive the > > broadcast then routers 2 thru 4 should receive the packets as > many > times > > as > > router 5. > > > > I would appreciate all the help I can get. I know you gurus > can help > me > > out. > > Thanks!! > > > > Wes > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=49045&t=48996 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
