Download - flowspec @ APF 2013
Tom Paseka, Courtesy of Terry Rodery
Aug 2013
Tom Paseka, Courtesy of Terry Rodery
Aug 2013
Flowspec @ APF Flowspec @ APF
2
BackgroundBackground
• RFC 5575 (2009)
• Piggybacks on top of existing BGP
• Supported by Juniper (and Alcatel too apparently?)
• Available in JunOS since 7.X
• ExaBGP support too.
3
OperationalOperational
• Configure rules on route server (config so easy a caveman could do it).
• Commit config.
• Rules are pushed via BGP to routers. I typically see the rules appear on my edge routers in a matter of seconds.
• Flowspec counters are available for viewing from CLI using “show firewall”.
4
DrawbacksDrawbacks
• Flowspec counters ARE NOT available via SNMP! Surely someone can fix this You’ll need to write the necessary poller, database, graphing, etc. to do this.
• Not able to use prefix-lists to define source/destination addresses. Must create multiple rules for multiple prefixes.
• Flowspec is only supported on M,MX,T-Series devices and is not available on EX and SRX.
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Sample “rule” configsSample “rule” configs
Discards all traffic to UDP port 80.
route DISCARD-80-UDP { match { protocol udp; destination-port 80; } then discard;}
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Sample “rule” configsSample “rule” configs
Rate-limit TCP SYN to 5Mbps. This will be the easiest rate limiting you’ve ever done on JunOS. No more manual policer configuration!
route 108.162.203.11-RL { match { destination 108.162.203.11/32; protocol tcp; tcp-flags 2; } then rate-limit 5m;}
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Sample “rule” configsSample “rule” configs
route 141.101.124.242-DISCARD { match destination 141.101.124.242/32; then discard;}
We no longer “nullroute” using BGP triggered blackhole to transit providers so we don’t lose visibility into the attack.
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Time for the cool stuff! (Graphs)
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Short Lived Syn FloodShort Lived Syn Flood
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Big attackBig attack
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Decaying long lived attackDecaying long lived attack
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1Gbps attack1Gbps attack
Questions?Questions?
Thank YouThank You
15
Bad PlayersBad Playersrange 198.32.176.0/24 - PAIX
198.32.176.0/24 141.101.86.1 100 0 13335 1299 701 i
198.32.176.0/24 141.101.90.1 100 0 13335 1299 701 i
.......snip
range 202.40.160.0/23 - HKIX
202.40.160.0/23 199.27.132.1 100 0 13335 4436 4134 4809 45474 i
202.40.160.0/23 108.162.235.1 100 0 13335 4436 4134 4809 45474 i
.......snip
range 206.223.123.0/24 - Equinix LA
206.223.123.0/24 103.22.203.1 100 0 13335 4637 6461 i
.......snip
range 218.100.59.0/24 - ACT-IX
218.100.59.0/24 108.162.247.1 100 0 13335 10026 45482 i
range 91.212.235.0/24 - Balkan IX
91.212.235.0/24 141.101.69.1 100 0 13335 12615 47872 49401 49401 i
range 198.32.177.0/24 - PAIX
198.32.177.0/24 141.101.67.1 100 0 13335 4436 2914 i
.......snip
range 206.223.123.0/24 - Equinix LA
206.223.123.0/24 103.22.203.1 100 0 13335 4637 6461 i
206.223.123.0/24 141.101.65.1 100 0 13335 4436 6461 i
.......snip
range 218.100.59.0/24 - ACT-IX
218.100.59.0/24 108.162.247.1 100 0 13335 10026 45482 i
range 91.212.235.0/24 - Balkan IX
91.212.235.0/24 141.101.69.1 100 0 13335 12615 49401 49401 49401 i
range 198.32.177.0/24 - PAIX
198.32.177.0/24 141.101.67.1 100 0 13335 4436 2914 i
198.32.177.0/24 141.101.72.1 100 0 13335 4436 2914 i
.......snip
range 198.32.132.0/24 - TELX
198.32.132.0/24 141.101.76.1 100 0 13335 4637 6461 22969 i
198.32.132.0/24 103.22.203.1 100 0 13335 4637 6461 22969 i
198.32.132.0/24 141.101.71.1 100 0 13335 1299 6461 22969 i
198.32.132.0/24 141.101.86.1 100 0 13335 1299 6461 22969 i
.......snip