[Snort-users] Help tuning snort for performance.

Joel Esler jesler at ...1935...
Thu Feb 11 13:15:36 EST 2010


Okay, let me tell you what I see when I look at these stats.  (BTW -- for those of you reading this list, this exactly the information we need when you write in asking "OMG, I am dropping teh pakets!! OMG")

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

You have a lot of rules running.

> 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

Okay, that's better.

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

Your box is working really hard.

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

Looks like your session table is full.  I usually see this result from two things:

1)  Too much traffic going through too small of a box
2)  What i like to call "Duplicate packets".  (More than one copy of the same traffic being spanned to the same box from two (three, four, five) different spans)

Most of the time it's #2.  So check your packet dumps and make sure you aren't getting more than one copy of your traffic.

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

You have a lot of fragmented traffic.  Might want to troubleshoot this if possible.

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

You have lots of small packets. (Fragments?  DNS?  Encrypted traffic?)

I see a bunch of other small indicators, but the above should give you enough to work on.

J



On Feb 11, 2010, at 12:51 PM, Andy Berryman wrote:

> 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
>  
>  
> ------------------------------------------------------------------------------
> SOLARIS 10 is the OS for Data Centers - provides features such as DTrace,
> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
> http://p.sf.net/sfu/solaris-dev2dev_______________________________________________
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>  
> --
> Joel Esler
> 302-223-5974
>  
>  
> 
> 
> 
>  
> This message from Cymtec Systems, Inc. contains confidential information and is solely for the use of the recipient(s) named above. If you are not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this message in error and that any review, disclosure, copying, distribution or use of the contents of this message is strictly prohibited. If you have received this message in error, please destroy it immediately and notify Cymtec Systems, Inc. by telephone at +1.314.993.8700 or by return e-mail.
>  
>  
> --
> Joel Esler
> 302-223-5974
>  
>  
> 
> 
>  
> This message from Cymtec Systems, Inc. contains confidential information and is solely for the use of the recipient(s) named above. If you are not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this message in error and that any review, disclosure, copying, distribution or use of the contents of this message is strictly prohibited. If you have received this message in error, please destroy it immediately and notify Cymtec Systems, Inc. by telephone at +1.314.993.8700 or by return e-mail.
>  

--
Joel Esler
302-223-5974





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