jonsblog.lewis.org

Jon Lewis's Blog

Thu, 28 Mar 2013. BCP 38 - Or why all edge networks need some form of valid prefix filtering. The Internet has been dealing with amplification attacks dependent on source address spoofing at least as far back as the mid to late 1990s. Smurf attacks. The common thread here is that both Smurf and DNS amplification attacks wouldn't be possible if the attackers couldn't spoof their target's IP address. With the above interface and route statement, only traffic received on FastEthernet1/0 with source addresse...

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Thu, 28 Mar 2013. BCP 38 - Or why all edge networks need some form of valid prefix filtering. The Internet has been dealing with amplification attacks dependent on source address spoofing at least as far back as the mid to late 1990s. Smurf attacks. The common thread here is that both Smurf and DNS amplification attacks wouldn't be possible if the attackers couldn't spoof their target's IP address. With the above interface and route statement, only traffic received on FastEthernet1/0 with source addresse...

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Jon Lewis's Blog | jonsblog.lewis.org Reviews

https://jonsblog.lewis.org

Thu, 28 Mar 2013. BCP 38 - Or why all edge networks need some form of valid prefix filtering. The Internet has been dealing with amplification attacks dependent on source address spoofing at least as far back as the mid to late 1990s. Smurf attacks. The common thread here is that both Smurf and DNS amplification attacks wouldn't be possible if the attackers couldn't spoof their target's IP address. With the above interface and route statement, only traffic received on FastEthernet1/0 with source addresse...

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jonsblog.lewis.org

1

Jon Lewis's Blog 28 03 2013

http://jonsblog.lewis.org/2013/03/28

Thu, 28 Mar 2013. BCP 38 - Or why all edge networks need some form of valid prefix filtering. The Internet has been dealing with amplification attacks dependent on source address spoofing at least as far back as the mid to late 1990s. Smurf attacks. The common thread here is that both Smurf and DNS amplification attacks wouldn't be possible if the attackers couldn't spoof their target's IP address. With the above interface and route statement, only traffic received on FastEthernet1/0 with source addresse...

2

Jon Lewis's Blog 19 01 2008

http://jonsblog.lewis.org/2008/01/19

Sat, 19 Jan 2008. RIR Minimums BGP prefix-list. I originally posted this BGP filter to a couple of mailing lists, most notably the NANOG list, back in September 2007. Http:/ www.merit.edu/mail.archives/nanog/2007-09/msg00103.html. This BGP route filter is based largely on Barry Greene's work available from. Ftp:/ ftp-eng.cisco.com/cons/isp/security/Ingress-Prefix-Filter-Templates/T-ip-prefix-filter-ingress-strict-check-v18.txt. If you currently use a distribute-list to filter incoming routes, you'll have...

3

Jon Lewis's Blog 09 02 2008

http://jonsblog.lewis.org/2008/02/09

Sat, 09 Feb 2008. So, you just upgraded your cisco 6500/7600 gear to Sup720-3BXL's because that's the lowest end supervisor module that has the tcam for full internet routes ( 244k routes). You may have read in the data sheet. That it's capable of "1,000,000 IPv4 routes; 500,000 IPv6 routes." That should be plenty of room for growth, right? Well, maybe not as much as you think. Show platform hardware capacity. Look for the output section labeled "L3 Forwarding Resources". i.e. Note: The numbers above fro...

4

Jon Lewis's Blog

http://jonsblog.lewis.org/internet/routing

Thu, 28 Mar 2013. BCP 38 - Or why all edge networks need some form of valid prefix filtering. The Internet has been dealing with amplification attacks dependent on source address spoofing at least as far back as the mid to late 1990s. Smurf attacks. The common thread here is that both Smurf and DNS amplification attacks wouldn't be possible if the attackers couldn't spoof their target's IP address. With the above interface and route statement, only traffic received on FastEthernet1/0 with source addresse...

5

Jon Lewis's Blog 05 02 2011

http://jonsblog.lewis.org/2011/02/05

Sat, 05 Feb 2011. A number of Tier-1/Tier-2 network service providers support a feature called real time black hole routing triggered via BGP. In simple terms, what this means is that with providers that support this, you can advertise a route to your transit provider(s) that tells them "I'd like you to null route this instead of routing it to me." Why would this be useful? Make sure your provider(s) support this. Look up what community strings they use for this. Using Level3 as the example, a search for...

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Thu, 28 Mar 2013. BCP 38 - Or why all edge networks need some form of valid prefix filtering. The Internet has been dealing with amplification attacks dependent on source address spoofing at least as far back as the mid to late 1990s. Smurf attacks. The common thread here is that both Smurf and DNS amplification attacks wouldn't be possible if the attackers couldn't spoof their target's IP address. With the above interface and route statement, only traffic received on FastEthernet1/0 with source addresse...

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