Hi, The tcpdump station was initially attached to Vlan 1, sniffing those bootp packets. But when the tcpdump station is moved to Vlan 4, and after I had shutdown Vlan 1, the problem is resolved.
Anyway to prevent this messages?? In the first place, it shouldn't be there, since there are no DHCP server configured on that segment right? Could this be a bug from that Series of Catalyst 2924?? Thanks. Regards, Cheeyong At 01:06 PM 2/1/02 -0500, Priscilla Oppenheimer wrote: >It's BOOTP (DHCP). It says so in the tcpdumb output. > >Also the IP length of 0x0148 is typical for a DHCP Request. (328 bytes in >decimal). > >Also see the 0xFF11? That's TTL = 255, and next layer = UDP. > >The other clue is that the IP source address is 00 00 00 00 and the IP >destination address is FF FF FF FF. > >At the UDP layer, we have source port = 0x0044 (68) and dest port = 0x0043 >(67). Yup, that's DHCP alright. > >Where is the tcpdumb station attached? Which VLAN? It will see all the >broadcasts for devices in its VLAN. The switch forwards them. This is >normal... > >Priscilla > >At 05:16 AM 2/1/02, Tay Chee Yong wrote: > >Hi all, > > > >Just like to enquire some issue regarding Catalyst 2924 > > > >I have a pretty old Catalyst 2924 (C2900XL-H-M) switch in my office running > >IOS Version 11.2(8)SA3, however, it seems that the switch is constantly > >sending out broadcast messages as captured by tcpdump. > > > >17:14:51.053952 0:10:b:3c:35:80 Broadcast ip 342: 0.0.0.0.bootpc > > >255.255.255.255.bootps: secs:41926 [|bootp] > >4500 0148 c93a 0000 ff11 f16a 0000 0000 > >ffff ffff 0044 0043 0134 0000 0101 0600 > >0000 0000 a3c6 0000 0000 0000 0000 0000 > >0000 0000 0000 0000 0010 0b3c 3580 0000 > >0000 0000 0000 0000 0000 0000 0000 0000 > >0000 > > > >I did not configure any IP address on Vlan 1 on the switch, but I did > >segment the switch to contain 2 more vlans (Vlan 2, 3) However, I also have > >some machines residing on Vlan 1. > > > >However, the broadcast problem disappear after I move out the vlan1 > >machines into another newly created Vlan (vlan 4), after I had shutdown > >Interface Vlan 1. > > > >Can anyone care to enlighten me? Thanks. > > > >Regards, > >Cheeyong >________________________ > >Priscilla Oppenheimer >http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=34163&t=34024 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
