HiSolutions like BGPmon.net,Cyclops,etc are doing a very good job of alerting  about the prefix hijack/configuration erros/experiments gonig on/etc.But i would like to ask "Alerting the victim is the best we can do after detecting such incidents" or what else we can do?What do you think about "BGP ability to Self recover form prefix hijacks or anomalies?" Is it possible?How?What do you think about "Self healing as the property of Internet?"Thank you.Akmal KhanMS-PhD StudentMMLab@SNU.Kr --- On Tue, 5/12/09, nanog-request@nanog.org <nanog-request@nanog.org> wrote: From: nanog-request@nanog.org <nanog-request@nanog.org> Subject: NANOG Digest, Vol 16, Issue 43 To: nanog@nanog.org Date: Tuesday, May 12, 2009, 1:04 AM Send NANOG mailing list submissions to     nanog@nanog.org To subscribe or unsubscribe via the World Wide Web, visit     http://mailman.nanog.org/mailman/listinfo/nanog or, via email, send a message with subject or body 'help' to     nanog-request@nanog.org You can reach the person managing the list at     nanog-owner@nanog.org When replying, please edit your Subject line so it is more specific than "Re: Contents of NANOG digest..." Today's Topics:    1. Re: two interfaces one subnet (David Devereaux-Weber)    2. Re: two interfaces one subnet (Nathan Ward)    3. Re: two interfaces one subnet (Arnold Nipper)    4. Re: two interfaces one subnet (Patrick W. Gilmore)    5. Re: two interfaces one subnet (Patrick W. Gilmore)    6. RE: two interfaces one subnet (Holmes,David A)    7. Re: two interfaces one subnet (Arnold Nipper)    8. Re: two interfaces one subnet (Patrick W. Gilmore)    9. Re: two interfaces one subnet (Chris Adams)   10. Re: two interfaces one subnet  (Kevin Oberman)   11. Re: two interfaces one subnet (Ben Scott) ---------------------------------------------------------------------- Message: 1 Date: Mon, 11 May 2009 17:08:45 -0500 From: David Devereaux-Weber <ddevereauxweber@gmail.com> Subject: Re: two interfaces one subnet To: Hector Herrera <hectorherrera@gmail.com> Cc: nanog@nanog.org Message-ID:     <f2675b350905111508t11d097afrb68ecb09d3798025@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 In my case, each Ethernet interface has its own unique MAC address. Dave On Mon, May 11, 2009 at 4:28 PM, Hector Herrera <hectorherrera@gmail.com>wrote:

On Mon, May 11, 2009 at 2:22 PM, David Devereaux-Weber <ddevereauxweber@gmail.com> wrote:

...

Chris,

I work with iHDTV <http://ihdtv.org>, a project that sends uncompressed high definition television (1.5 Gbps) as UDP over two 1 Gbps interfaces.  If both interfaces are on the same subnet, the OS sees the same router (gateway) address on both interfaces, and the results are sub-optimal ... around 50% packet loss.

packet loss is probably due to the network switch having to re-learn the location of the MAC address constantly as it sees packets on two or more ports with the same MAC address (think STP loops).

If your network stack and network device (switch) supports LACP, then you can have multiple connections between a host and a network device.   That is a very easy way to increase capacity and add redundancy.

That is how all of our VMWare ESX 3.5i servers are connected.

Hector

------------------------------ Message: 2 Date: Tue, 12 May 2009 10:08:49 +1200 From: Nathan Ward <nanog@daork.net> Subject: Re: two interfaces one subnet To: nanog list <nanog@nanog.org> Message-ID: <24F5463D-C5B0-46BD-AB6A-1C376BE742EF@daork.net> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes On 12/05/2009, at 9:00 AM, Charles Wyble wrote:

What does two interfaces in one subnet mean?

Two NICs? Or virtual interfaces?

Also, what does one subnet mean? A. Using the same IP prefix on two different networks (ie. ethernet  broadcast domains) with an interface in to each, or B. running two  interfaces in to the same network (ie. ethernet broadcast domain). In the case of A, are you re-using numbers on each side? In the case of B, are you wanting both interfaces to have the same  number(s)? -- Nathan Ward ------------------------------ Message: 3 Date: Tue, 12 May 2009 00:13:19 +0200 From: Arnold Nipper <arnold@nipper.de> Subject: Re: two interfaces one subnet To: "Patrick W. Gilmore" <patrick@ianai.net> Cc: NANOG list <nanog@nanog.org> Message-ID: <4A08A2FF.4040306@nipper.de> Content-Type: text/plain; charset="iso-8859-1" On 11.05.2009 23:47 Patrick W. Gilmore wrote

On May 11, 2009, at 5:19 PM, Alex H. Ryu wrote:

...

It may be allowed from host-level, but from router equipment, I don't think it was allowed at all.

Ever used HSRP / VRRP?  Two interfaces in the same subnet.  Works  fine.  In fact, most people think it works _better_ than one interface  in the same subnet.

I guess you are mixing interfaces with IPs now. Don't you? Arnold -- Arnold Nipper / nIPper consulting, Sandhausen, Germany email: arnold@nipper.de       phone: +49 6224 9259 299 mobile: +49 172 2650958         fax: +49 6224 9259 333