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.

5

Sample “rule” configsSample “rule” configs

Discards all traffic to UDP port 80.

route DISCARD-80-UDP { match { protocol udp; destination-port 80; } then discard;}

6

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;}

7

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.

8

Time for the cool stuff! (Graphs)

9

Short Lived Syn FloodShort Lived Syn Flood

10

Big attackBig attack

11

Decaying long lived attackDecaying long lived attack

12

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