nanog mailing list archives
Re: Smurfing
From: Dean Anderson <dean () av8 com>
Date: Mon, 16 Feb 1998 11:50:21 -0500
On Fri, 13 Feb 1998, Dean Anderson wrote:
If the ICMP packet is permitted in to the internal network then it doesn't matter where the network is, only that it have sufficient bandwidth to generate the necessary traffic out to the border (from the smurfer's POV). This is why it needs to be turned off on all LAN segments (assuming it isn't used for other things).
If you enable broadcast forwarding on a cisco, thats true. But you should have access filters in place at your borders to prevent directed broadcasts to your networks and subnets. Internally, directed broadcasts are (often) used. The main thing is to prevent others from using them, either unnecessarilly, or maliciously.
How often is SNMP host discovery done?
It's configurable. I think the default shipped is every 15 minutes. I usually turn it down to once a day.
Can't HPOV be directed to just discover on a specific network?
It can, and in fact it should be. But if you have turned off forwarding directed broadcasts on that network, it won't work. --Dean ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Plain Aviation, Inc dean () av8 com LAN/WAN/UNIX/NT/TCPIP http://www.av8.com ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Current thread:
- Re: Smurfing, (continued)
- Re: Smurfing Randy Bush (Feb 16)
- Message not available
- Re: Smurfing Jay R. Ashworth (Feb 16)
- Re: Smurfing Alex P. Rudnev (Feb 16)
- Re: Smurfing Paul Ferguson (Feb 17)
- Re: Smurfing Bradley Reynolds (Feb 17)
- Re: Smurfing Tatsuya Kawasaki (Feb 17)
- Re: Smurfing Alex P. Rudnev (Feb 18)
- Re: Smurfing Paul Ferguson (Feb 18)
- Re: Smurfing Dean Anderson (Feb 13)
- Re: Smurfing ken emery (Feb 13)
- Re: Smurfing Dean Anderson (Feb 16)
- Message not available
- Re: Smurfing Jay R. Ashworth (Feb 13)
- Re: Smurfing Craig A. Huegen (Feb 13)
- Re: Smurfing David J. Schmidt (Feb 15)
- Re: Smurfing Steve Camas (Feb 15)
- Re: Smurfing Jon Lewis (Feb 15)
- Re: Smurfing Craig A. Huegen (Feb 13)
- Re: Smurfing Craig A. Huegen (Feb 13)
- Re: Smurfing Michael Shields (Feb 15)