[Snort-users] Help tuning snort for performance.

Andy Berryman aberryman at ...14765...
Thu Feb 11 12:51:30 EST 2010


Here's the same box, nothing changed. You can see it's even the same
snort process running. I'm in the process of trying to get the customer
to tune their rules. Trying to make it as least invasive as possible. 

 

Feb 11 17:30:11 (none) snort[21463]: Snort Realtime Performance  : Thu
Feb 11 17:30:11 2010 --------------------------

Feb 11 17:30:11 (none) snort[21463]: Pkts Recv:   3773794

Feb 11 17:30:11 (none) snort[21463]: Pkts Drop:   2583331

Feb 11 17:30:11 (none) snort[21463]: % Dropped:   68.454%

Feb 11 17:30:11 (none) snort[21463]: Blocked:     0

Feb 11 17:30:11 (none) snort[21463]: Pkts Filtered TCP:     0

Feb 11 17:30:11 (none) snort[21463]: Pkts Filtered UDP:     0

Feb 11 17:30:11 (none) snort[21463]: Mbits/Sec:   165.153 (wire)

Feb 11 17:30:11 (none) snort[21463]: Mbits/Sec:   0.575 (ip fragmented)

Feb 11 17:30:11 (none) snort[21463]: Mbits/Sec:   0.344 (ip reassembled)

Feb 11 17:30:11 (none) snort[21463]: Mbits/Sec:   2.654 (tcp rebuilt)

Feb 11 17:30:11 (none) snort[21463]: Mbits/Sec:   168.149 (app layer)

Feb 11 17:30:11 (none) snort[21463]: Bytes/Pkt:   515 (wire)

Feb 11 17:30:11 (none) snort[21463]: Bytes/Pkt:   659 (ip fragmented)

Feb 11 17:30:11 (none) snort[21463]: Bytes/Pkt:   1549 (ip reassembled)

Feb 11 17:30:11 (none) snort[21463]: Bytes/Pkt:   528 (tcp rebuilt)

Feb 11 17:30:11 (none) snort[21463]: Bytes/Pkt:   516 (app layer)

Feb 11 17:30:11 (none) snort[21463]: KPkts/Sec:   40.054 (wire)

Feb 11 17:30:11 (none) snort[21463]: KPkts/Sec:   0.109 (ip fragmented)

Feb 11 17:30:11 (none) snort[21463]: KPkts/Sec:   0.028 (ip reassembled)

Feb 11 17:30:11 (none) snort[21463]: KPkts/Sec:   0.627 (tcp rebuilt)

Feb 11 17:30:11 (none) snort[21463]: KPkts/Sec:   40.707 (app layer)

Feb 11 17:30:11 (none) snort[21463]: PatMatch:    82.003%

Feb 11 17:30:11 (none) snort[21463]: CPU Usage:   85.559% (user)
14.240% (sys)  0.201% (idle)

Feb 11 17:30:11 (none) snort[21463]: Alerts/Sec             :  30.315

Feb 11 17:30:11 (none) snort[21463]: Syns/Sec               :  123.311

Feb 11 17:30:11 (none) snort[21463]: Syn-Acks/Sec           :  125.027

Feb 11 17:30:11 (none) snort[21463]: New Cached Sessions/Sec:  207.727

Feb 11 17:30:11 (none) snort[21463]: Midstream Sessions/Sec :  119.475

Feb 11 17:30:11 (none) snort[21463]: Cached Sessions Del/Sec:  209.275

Feb 11 17:30:11 (none) snort[21463]: Closed Sessions/Sec    :  9.421

Feb 11 17:30:11 (none) snort[21463]: TimedOut Sessions/Sec  :  255.874

Feb 11 17:30:11 (none) snort[21463]: Pruned Sessions/Sec    :  0.000

Feb 11 17:30:11 (none) snort[21463]: Dropped Async Ssns/Sec :  0.000

Feb 11 17:30:11 (none) snort[21463]: Current Cached Sessions:  584948

Feb 11 17:30:11 (none) snort[21463]: Sessions Initializing  :  110727

Feb 11 17:30:11 (none) snort[21463]: Sessions Established   :  239955

Feb 11 17:30:11 (none) snort[21463]: Sessions Closing       :  234445

Feb 11 17:30:11 (none) snort[21463]: Max Cached Sessions    :  585415

Feb 11 17:30:11 (none) snort[21463]: Max Sessions (interval):  585415

Feb 11 17:30:11 (none) snort[21463]: Stream Flushes/Sec     :  627.252

Feb 11 17:30:11 (none) snort[21463]: Stream Cache Faults/Sec:  765

Feb 11 17:30:11 (none) snort[21463]: Stream Cache Timeouts  :  7605

Feb 11 17:30:11 (none) snort[21463]: Frag Creates()s/Sec    :  43.268

Feb 11 17:30:11 (none) snort[21463]: Frag Completes()s/Sec  :  27.825

Feb 11 17:30:11 (none) snort[21463]: Frag Inserts()s/Sec    :  65.710

Feb 11 17:30:11 (none) snort[21463]: Frag Deletes/Sec       :  43.302

Feb 11 17:30:11 (none) snort[21463]: Frag AutoFrees/Sec     :  15.477

Feb 11 17:30:11 (none) snort[21463]: Frag Flushes/Sec       :  27.791

Feb 11 17:30:11 (none) snort[21463]: Current Cached Frags   :  64793

Feb 11 17:30:11 (none) snort[21463]: Max Cached Frags       :  64794

Feb 11 17:30:11 (none) snort[21463]: Frag Timeouts          :  189

Feb 11 17:30:11 (none) snort[21463]: Frag Faults            :  0

Feb 11 17:30:11 (none) snort[21463]: New Cached UDP Ssns/Sec:  0.000

Feb 11 17:30:11 (none) snort[21463]: Cached UDP Ssns Del/Sec:  0.000

Feb 11 17:30:11 (none) snort[21463]: Current Cached UDP Ssns:  0

Feb 11 17:30:11 (none) snort[21463]: Max Cached UDP Ssns    :  0

Feb 11 17:30:11 (none) snort[21463]: Snort Maximum Performance

Feb 11 17:30:11 (none) snort[21463]: -------------------------

Feb 11 17:30:11 (none) snort[21463]: Mbits/Second

Feb 11 17:30:11 (none) snort[21463]: ----------------

Feb 11 17:30:11 (none) snort[21463]: Snort:       196.530

Feb 11 17:30:11 (none) snort[21463]: Sniffing:    1180.850

Feb 11 17:30:11 (none) snort[21463]: Combined:    168.488

Feb 11 17:30:11 (none) snort[21463]: uSeconds/Pkt

Feb 11 17:30:11 (none) snort[21463]: ----------------

Feb 11 17:30:11 (none) snort[21463]: Snort:       21.018

Feb 11 17:30:11 (none) snort[21463]: Sniffing:    3.498

Feb 11 17:30:11 (none) snort[21463]: Combined:    24.516

Feb 11 17:30:11 (none) snort[21463]: KPkts/Second

Feb 11 17:30:11 (none) snort[21463]: ------------------

Feb 11 17:30:11 (none) snort[21463]: Snort:       47.578

Feb 11 17:30:11 (none) snort[21463]: Sniffing:    285.870

Feb 11 17:30:11 (none) snort[21463]: Combined:    40.789

Feb 11 17:30:11 (none) snort[21463]:

Feb 11 17:30:11 (none) snort[21463]:

Feb 11 17:30:11 (none) snort[21463]: Protocol Byte Flows - %Total Flow

Feb 11 17:30:11 (none) snort[21463]:
--------------------------------------

Feb 11 17:30:11 (none) snort[21463]: TCP:   85.96%

Feb 11 17:30:11 (none) snort[21463]: UDP:   0.67%

Feb 11 17:30:11 (none) snort[21463]: ICMP:  0.05%

Feb 11 17:30:11 (none) snort[21463]: OTHER: 13.32%

Feb 11 17:30:11 (none) snort[21463]:

Feb 11 17:30:11 (none) snort[21463]:

Feb 11 17:30:11 (none) snort[21463]: PacketLen - %TotalPackets

Feb 11 17:30:11 (none) snort[21463]: -------------------------

Feb 11 17:30:11 (none) snort[21463]: Bytes[60] 24.34%

Feb 11 17:30:11 (none) snort[21463]: Bytes[62] 0.57%

Feb 11 17:30:11 (none) snort[21463]: Bytes[63] 0.18%

Feb 11 17:30:11 (none) snort[21463]: Bytes[64] 0.41%

Feb 11 17:30:11 (none) snort[21463]: Bytes[65] 0.17%

Feb 11 17:30:11 (none) snort[21463]: Bytes[66] 0.82%

Feb 11 17:30:11 (none) snort[21463]: Bytes[71] 0.96%

Feb 11 17:30:11 (none) snort[21463]: Bytes[74] 0.19%

Feb 11 17:30:11 (none) snort[21463]: Bytes[76] 0.16%

Feb 11 17:30:11 (none) snort[21463]: Bytes[77] 0.11%

Feb 11 17:30:11 (none) snort[21463]: Bytes[78] 0.11%

Feb 11 17:30:11 (none) snort[21463]: Bytes[80] 0.40%

Feb 11 17:30:11 (none) snort[21463]: Bytes[82] 4.56%

Feb 11 17:30:11 (none) snort[21463]: Bytes[85] 0.10%

Feb 11 17:30:11 (none) snort[21463]: Bytes[86] 0.15%

Feb 11 17:30:11 (none) snort[21463]: Bytes[87] 0.11%

Feb 11 17:30:11 (none) snort[21463]: Bytes[88] 0.23%

Feb 11 17:30:11 (none) snort[21463]: Bytes[90] 0.57%

Feb 11 17:30:11 (none) snort[21463]: Bytes[91] 0.27%

Feb 11 17:30:11 (none) snort[21463]: Bytes[92] 0.21%

Feb 11 17:30:11 (none) snort[21463]: Bytes[93] 0.84%

Feb 11 17:30:11 (none) snort[21463]: Bytes[94] 3.95%

Feb 11 17:30:11 (none) snort[21463]: Bytes[95] 0.15%

Feb 11 17:30:11 (none) snort[21463]: Bytes[97] 0.16%

Feb 11 17:30:11 (none) snort[21463]: Bytes[98] 0.18%

Feb 11 17:30:11 (none) snort[21463]: Bytes[99] 0.50%

Feb 11 17:30:11 (none) snort[21463]: Bytes[102] 0.37%

Feb 11 17:30:11 (none) snort[21463]: Bytes[104] 0.58%

Feb 11 17:30:11 (none) snort[21463]: Bytes[105] 0.61%

Feb 11 17:30:11 (none) snort[21463]: Bytes[106] 0.35%

Feb 11 17:30:11 (none) snort[21463]: Bytes[107] 0.20%

Feb 11 17:30:11 (none) snort[21463]: Bytes[108] 0.14%

Feb 11 17:30:11 (none) snort[21463]: Bytes[109] 1.38%

Feb 11 17:30:11 (none) snort[21463]: Bytes[110] 0.20%

Feb 11 17:30:11 (none) snort[21463]: Bytes[111] 0.35%

Feb 11 17:30:11 (none) snort[21463]: Bytes[113] 0.11%

Feb 11 17:30:11 (none) snort[21463]: Bytes[114] 0.26%

Feb 11 17:30:11 (none) snort[21463]: Bytes[115] 0.15%

Feb 11 17:30:11 (none) snort[21463]: Bytes[116] 0.23%

Feb 11 17:30:11 (none) snort[21463]: Bytes[117] 1.02%

Feb 11 17:30:11 (none) snort[21463]: Bytes[118] 0.33%

Feb 11 17:30:11 (none) snort[21463]: Bytes[119] 0.19%

Feb 11 17:30:11 (none) snort[21463]: Bytes[122] 0.49%

Feb 11 17:30:11 (none) snort[21463]: Bytes[124] 0.20%

Feb 11 17:30:11 (none) snort[21463]: Bytes[126] 0.30%

Feb 11 17:30:11 (none) snort[21463]: Bytes[128] 0.13%

Feb 11 17:30:11 (none) snort[21463]: Bytes[130] 1.07%

Feb 11 17:30:11 (none) snort[21463]: Bytes[134] 0.17%

Feb 11 17:30:11 (none) snort[21463]: Bytes[140] 0.14%

Feb 11 17:30:11 (none) snort[21463]: Bytes[142] 1.38%

Feb 11 17:30:11 (none) snort[21463]: Bytes[145] 0.12%

Feb 11 17:30:11 (none) snort[21463]: Bytes[146] 0.19%

Feb 11 17:30:11 (none) snort[21463]: Bytes[150] 0.14%

Feb 11 17:30:11 (none) snort[21463]: Bytes[154] 0.57%

Feb 11 17:30:11 (none) snort[21463]: Bytes[156] 0.13%

Feb 11 17:30:11 (none) snort[21463]: Bytes[158] 2.91%

Feb 11 17:30:11 (none) snort[21463]: Bytes[162] 1.51%

Feb 11 17:30:11 (none) snort[21463]: Bytes[164] 0.23%

Feb 11 17:30:11 (none) snort[21463]: Bytes[166] 0.24%

Feb 11 17:30:11 (none) snort[21463]: Bytes[168] 0.11%

Feb 11 17:30:11 (none) snort[21463]: Bytes[170] 0.72%

Feb 11 17:30:11 (none) snort[21463]: Bytes[172] 0.36%

Feb 11 17:30:11 (none) snort[21463]: Bytes[174] 0.29%

Feb 11 17:30:11 (none) snort[21463]: Bytes[178] 0.25%

Feb 11 17:30:11 (none) snort[21463]: Bytes[182] 0.28%

Feb 11 17:30:11 (none) snort[21463]: Bytes[186] 0.53%

Feb 11 17:30:11 (none) snort[21463]: Bytes[188] 0.51%

Feb 11 17:30:11 (none) snort[21463]: Bytes[190] 0.12%

Feb 11 17:30:11 (none) snort[21463]: Bytes[193] 0.23%

Feb 11 17:30:11 (none) snort[21463]: Bytes[194] 0.37%

Feb 11 17:30:11 (none) snort[21463]: Bytes[196] 0.24%

Feb 11 17:30:11 (none) snort[21463]: Bytes[198] 0.24%

Feb 11 17:30:11 (none) snort[21463]: Bytes[202] 0.43%

Feb 11 17:30:11 (none) snort[21463]: Bytes[206] 0.13%

Feb 11 17:30:11 (none) snort[21463]: Bytes[208] 0.10%

Feb 11 17:30:11 (none) snort[21463]: Bytes[210] 0.15%

Feb 11 17:30:11 (none) snort[21463]: Bytes[214] 0.25%

Feb 11 17:30:11 (none) snort[21463]: Bytes[218] 0.13%

Feb 11 17:30:11 (none) snort[21463]: Bytes[222] 0.16%

Feb 11 17:30:11 (none) snort[21463]: Bytes[228] 0.14%

Feb 11 17:30:11 (none) snort[21463]: Bytes[230] 0.70%

Feb 11 17:30:11 (none) snort[21463]: Bytes[234] 0.15%

Feb 11 17:30:11 (none) snort[21463]: Bytes[238] 0.37%

Feb 11 17:30:11 (none) snort[21463]: Bytes[242] 0.41%

Feb 11 17:30:11 (none) snort[21463]: Bytes[246] 0.35%

Feb 11 17:30:11 (none) snort[21463]: Bytes[250] 0.10%

Feb 11 17:30:11 (none) snort[21463]: Bytes[254] 0.11%

Feb 11 17:30:11 (none) snort[21463]: Bytes[262] 0.11%

Feb 11 17:30:11 (none) snort[21463]: Bytes[330] 0.10%

Feb 11 17:30:11 (none) snort[21463]: Bytes[441] 0.11%

Feb 11 17:30:11 (none) snort[21463]: Bytes[1230] 0.56%

Feb 11 17:30:11 (none) snort[21463]: Bytes[1414] 0.14%

Feb 11 17:30:11 (none) snort[21463]: Bytes[1442] 0.27%

Feb 11 17:30:11 (none) snort[21463]: Bytes[1474] 1.59%

Feb 11 17:30:11 (none) snort[21463]: Bytes[1486] 0.94%

Feb 11 17:30:11 (none) snort[21463]: Bytes[1506] 0.36%

Feb 11 17:30:11 (none) snort[21463]: Bytes[1514] 23.30%

Feb 11 17:30:11 (none) snort[21463]:

Feb 11 17:30:11 (none) snort[21463]:

Feb 11 17:30:11 (none) snort[21463]: TCP Port Flows

Feb 11 17:30:11 (none) snort[21463]: --------------

Feb 11 17:30:11 (none) snort[21463]: Port[25] 1.54% of Total, Src:
6.84% Dst:  93.16%

Feb 11 17:30:11 (none) snort[21463]: Port[80] 11.97% of Total, Src:
88.38% Dst:  11.62%

Feb 11 17:30:11 (none) snort[21463]: Port[135] 0.33% of Total, Src:
45.33% Dst:  54.67%

Feb 11 17:30:11 (none) snort[21463]: Port[139] 0.36% of Total, Src:
47.18% Dst:  52.82%

Feb 11 17:30:11 (none) snort[21463]: Port[389] 0.42% of Total, Src:
76.60% Dst:  23.40%

Feb 11 17:30:11 (none) snort[21463]: Port[443] 1.33% of Total, Src:
86.63% Dst:  13.37%

Feb 11 17:30:11 (none) snort[21463]: Port[445] 44.86% of Total, Src:
46.94% Dst:  53.06%

Feb 11 17:30:11 (none) snort[21463]: Port[515] 0.22% of Total, Src:
7.96% Dst:  92.04%

Feb 11 17:30:11 (none) snort[21463]: Ports[High<->High]: 38.94%

Feb 11 17:30:11 (none) snort[21463]:

Feb 11 17:30:11 (none) snort[21463]:

Feb 11 17:30:11 (none) snort[21463]: UDP Port Flows

Feb 11 17:30:11 (none) snort[21463]: --------------

Feb 11 17:30:11 (none) snort[21463]: Port[53] 5.34% of Total, Src:
68.10% Dst:  31.90%

Feb 11 17:30:11 (none) snort[21463]: Port[67] 0.14% of Total, Src:
46.95% Dst:  53.05%

Feb 11 17:30:11 (none) snort[21463]: Port[88] 3.46% of Total, Src:
62.28% Dst:  37.72%

Feb 11 17:30:11 (none) snort[21463]: Port[123] 0.30% of Total, Src:
50.00% Dst:  50.00%

Feb 11 17:30:11 (none) snort[21463]: Port[137] 6.93% of Total, Src:
51.04% Dst:  48.96%

Feb 11 17:30:11 (none) snort[21463]: Port[138] 0.73% of Total, Src:
50.00% Dst:  50.00%

Feb 11 17:30:11 (none) snort[21463]: Port[161] 10.38% of Total, Src:
43.65% Dst:  56.35%

Feb 11 17:30:11 (none) snort[21463]: Port[389] 0.68% of Total, Src:
42.25% Dst:  57.75%

Feb 11 17:30:11 (none) snort[21463]: Port[514] 2.58% of Total, Src:
46.69% Dst:  53.31%

Feb 11 17:30:11 (none) snort[21463]: Port[902] 1.11% of Total, Src:
0.00% Dst: 100.00%

Feb 11 17:30:11 (none) snort[21463]: Ports[High<->High]: 73.35%

Feb 11 17:30:11 (none) snort[21463]:

Feb 11 17:30:11 (none) snort[21463]:

Feb 11 17:30:11 (none) snort[21463]: ICMP Type Flows

Feb 11 17:30:11 (none) snort[21463]: ---------------

Feb 11 17:30:11 (none) snort[21463]: Type[0] 27.10% of Total

Feb 11 17:30:11 (none) snort[21463]: Type[3] 41.30% of Total

Feb 11 17:30:11 (none) snort[21463]: Type[8] 31.50% of Total

Feb 11 17:30:11 (none) snort[21463]: Type[11] 0.10% of Total

Feb 11 17:30:11 (none) snort[21463]:

Feb 11 17:30:11 (none) snort[21463]:

Feb 11 17:30:11 (none) snort[21463]: Snort Setwise Event Stats

Feb 11 17:30:11 (none) snort[21463]: -------------------------

Feb 11 17:30:11 (none) snort[21463]: Total Events:           8303325

Feb 11 17:30:11 (none) snort[21463]: Qualified Events:       203

Feb 11 17:30:11 (none) snort[21463]: Non-Qualified Events:   8303122

Feb 11 17:30:11 (none) snort[21463]: %Qualified Events:      0.0024%

Feb 11 17:30:11 (none) snort[21463]: %Non-Qualified Events:  99.9976%

 

From: Joel Esler [mailto:jesler at ...1935...] 
Sent: Thursday, February 11, 2010 11:35 AM
To: Andy Berryman
Cc: snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] Help tuning snort for performance.

 

Frag3 tuning shouldn't affect syn/sec and syn-ack/sec.

 

The stats you posted below tells me two things:

 

1)  Your syn and syn/acks aren't 1:1.

2)  Your packet size is small (VPN?  GRE? DNS?)

 

 

J

 

On Feb 11, 2010, at 12:26 PM, Andy Berryman wrote:





Actually, it's not. The syn/sec and the syn-ack/sec were really close to
1:1 before I started in on Frag3 tuning.

 

-bash-2.05b# tcpdump -i eth1

17:04:23.835615 IP 172.17.23.8.1494 > 10.151.100.3.59782: P
2141564463:2141564471(8) ack 1794773895 win 63861

17:04:23.835615 IP 172.17.23.8.1494 > 10.151.100.3.59782: P 0:8(8) ack 1
win 63861

17:04:23.839616 IP 10.153.13.32.2738 > 10.153.21.43.1433: . ack 4501 win
63836

17:04:23.839616 IP 10.153.13.32.2738 > 10.153.21.43.1433: . ack 4501 win
63836

17:04:23.839616 IP 10.153.19.13.1433 > 10.153.19.12.4744: P 1:134(133)
ack 50 win 65485

17:04:23.839616 IP 10.153.19.13.1433 > 10.153.19.12.4744: P 1:134(133)
ack 50 win 65485

17:04:23.839616 IP 10.153.13.32.2738 > 10.153.21.43.1433: . ack 4501 win
63836

17:04:23.839616 IP 10.153.13.32.2738 > 10.153.21.43.1433: . ack 4501 win
63836

17:04:23.839616 IP 10.174.3.83.2180 > 10.16.14.14.445: P 63:1239(1176)
ack 4537 win 64316

17:04:23.839616 IP 10.174.3.83.2180 > 10.16.14.14.445: P 63:1239(1176)
ack 4537 win 64316

17:04:23.839616 IP 10.150.90.25.1205 > 10.153.1.171.1433: P 142:316(174)
ack 87 win 63941

17:04:23.839616 IP 10.150.90.25.1205 > 10.153.1.171.1433: P 142:316(174)
ack 87 win 63941

17:04:23.839616 IP 172.16.20.19 > 10.42.128.37: gre-proto-0x883e

17:04:23.839616 IP 172.16.20.19 > 10.42.128.37: gre-proto-0x883e

30.10.25.3278: P 312:416(104) ack 293 win 64475

 

187 packets captured

12341 packets received by filter

11942 packets dropped by kernel

 

 

From: Joel Esler [mailto:jesler at ...1935...] 
Sent: Thursday, February 11, 2010 11:16 AM
To: Andy Berryman
Cc: snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] Help tuning snort for performance.

 

Is your sensor in front of a firewall (or similar)?    It looks like it:

	Feb 11 16:19:11 (none) snort[21463]: Syns/Sec               :
366.021

	Feb 11 16:19:11 (none) snort[21463]: Syn-Acks/Sec           :
150.862

 

Joel

 

 

------------------------------------------------------------------------
------
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Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
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--

Joel Esler

302-223-5974

 

 






 

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--

Joel Esler

302-223-5974

 

 





 


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