So there isn't a broadcast address for all /27 subnets? I basically understand that the last address of each subnet is reserved for subnet broadcast. I was just wondering if the broadcasting architecture allowed for all subnets to be broadcasted at once. And Mark, since you are the only one replying mind if you check out the CCO link in the original post and tell me your views on the issues that I have highlighted. I'll provide the link again
http://www.cisco.com/warp/public/105/40.html In that example, I have a feeling that routers do forward subnet directed broadcasts. Can anyone else explain the behaviour of the routers in the example i.e. broadcast packets bouncing between Routers 1 and 5. Any comments is greatly appreciated. Thank you. ""Vicuna, Mark"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > 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. > > > 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=49043&t=48996 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
