[Oisf-users] tcp.segment_memcap_drop couldn't be kept at zero, no matters how much memory we assign

Tue Dec 4 12:01:07 UTC 2012

   Hi, with the suggestions you gave me, and with some more reading, I
almost keep the IDS without drops, but, unfortunatelly Suricata crash,
always with the same error:

[45249.968058] AFPacketeth58[2096] general protection ip:477861
sp:7fbe28cc5bb0 error:0 in suricata[400000+1a5000]

Please let me know how can I help to debug this problem.
Thanks!

On 12/01/2012 10:03 AM, Peter Manev wrote:
> Hi ,
>
> Martin is very right about the flow-timeouts - very important, not to
forget to adjust those.
> 300 sec is 5 min...on a busy network .... -
> tcp:
> established: 3600 - (default)
> 1 hr can have some serious impact :)
>
> It is funny you mention about the drops.. I just had a quick chat with
Victor about drops in general just a few days ago.
> Here is some of our values/results on one of our test boxes (9.5Gb/s
traffic):
>
> YAML:
> flow-timeouts:
>
> default:
> new: 5 #30
> established: 10# 300
> closed: 0
> emergency-new: 1 #10
> emergency-established: 2 #100
> emergency-closed: 0
> tcp:
> new: 5 #60
> established: 300 # 3600
> closed: 10 #30
> emergency-new: 1 # 10
> emergency-established: 5 # 300
> emergency-closed: 20 #20
> udp:
> new: 5 #30
> established: 5 # 300
> emergency-new: 5 #10
> emergency-established: 5 # 100
> icmp:
> new: 5 #30
> established: 5 % 300
> emergency-new: 5 #10
> emergency-established: 5 # 100
>
> ......
> stream:
> memcap: 16gb
> max-sessions: 20000000
> prealloc-sessions: 10000000
> checksum-validation: no # reject wrong csums
> #checksum-validation: yes # reject wrong csums
> inline: no # no inline mode
> reassembly:
> memcap: 12gb
> #memcap: 8gb
> depth: 12mb # reassemble 1mb into a stream
> toserver-chunk-size: 2560
> toclient-chunk-size: 2560
>
> # Host table:
> #
> # Host table is used by tagging and per host thresholding subsystems.
> #
> host:
> hash-size: 4096
> prealloc: 1000
> memcap: 16777216
>
> ......
> # Defrag settings:
>
> defrag:
> #trackers: 262144 # number of defragmented flows to follow
> #max-frags: 262144 #number of fragments per-flow
> trackers: 65535
> max-frags: 65535 # number of fragments per-flow
> prealloc: yes
> timeout: 10
>
>
>
> Al this is using af_packet 16 threads , on a 16CPU(with Hyperthrd) box 32
GB RAM, with some special intel 10G NIC tuning, ubuntu LTS 12.04, running
latest git with 7K EmThr rules.
> Some more info:
>
>
>
> pevman at suricata:~$ sudo grep -n "drop"
/var/data/regit/log/suricata/stats.log | tail -48
> 2504179:capture.kernel_drops | AFPacketeth31 | 0
> 2504209:tcp.ssn_memcap_drop | AFPacketeth31 | 0
> 2504218:tcp.segment_memcap_drop | AFPacketeth31 | 0
> 2504224:capture.kernel_drops | AFPacketeth32 | 0
> 2504254:tcp.ssn_memcap_drop | AFPacketeth32 | 0
> 2504263:tcp.segment_memcap_drop | AFPacketeth32 | 0
> 2504269:capture.kernel_drops | AFPacketeth33 | 0
> 2504299:tcp.ssn_memcap_drop | AFPacketeth33 | 0
> 2504308:tcp.segment_memcap_drop | AFPacketeth33 | 0
> 2504314:capture.kernel_drops | AFPacketeth34 | 0
> 2504344:tcp.ssn_memcap_drop | AFPacketeth34 | 0
> 2504353:tcp.segment_memcap_drop | AFPacketeth34 | 0
> 2504359:capture.kernel_drops | AFPacketeth35 | 0
> 2504389:tcp.ssn_memcap_drop | AFPacketeth35 | 0
> 2504398:tcp.segment_memcap_drop | AFPacketeth35 | 0
> 2504404:capture.kernel_drops | AFPacketeth36 | 0
> 2504434:tcp.ssn_memcap_drop | AFPacketeth36 | 0
> 2504443:tcp.segment_memcap_drop | AFPacketeth36 | 0
> 2504449:capture.kernel_drops | AFPacketeth37 | 0
> 2504479:tcp.ssn_memcap_drop | AFPacketeth37 | 0
> 2504488:tcp.segment_memcap_drop | AFPacketeth37 | 0
> 2504494:capture.kernel_drops | AFPacketeth38 | 0
> 2504524:tcp.ssn_memcap_drop | AFPacketeth38 | 0
> 2504533:tcp.segment_memcap_drop | AFPacketeth38 | 0
> 2504539:capture.kernel_drops | AFPacketeth39 | 0
> 2504569:tcp.ssn_memcap_drop | AFPacketeth39 | 0
> 2504578:tcp.segment_memcap_drop | AFPacketeth39 | 0
> 2504584:capture.kernel_drops | AFPacketeth310 | 0
> 2504614:tcp.ssn_memcap_drop | AFPacketeth310 | 0
> 2504623:tcp.segment_memcap_drop | AFPacketeth310 | 0
> 2504629:capture.kernel_drops | AFPacketeth311 | 0
> 2504659:tcp.ssn_memcap_drop | AFPacketeth311 | 0
> 2504668:tcp.segment_memcap_drop | AFPacketeth311 | 0
> 2504674:capture.kernel_drops | AFPacketeth312 | 0
> 2504704:tcp.ssn_memcap_drop | AFPacketeth312 | 0
> 2504713:tcp.segment_memcap_drop | AFPacketeth312 | 0
> 2504719:capture.kernel_drops | AFPacketeth313 | 0
> 2504749:tcp.ssn_memcap_drop | AFPacketeth313 | 0
> 2504758:tcp.segment_memcap_drop | AFPacketeth313 | 0
> 2504764:capture.kernel_drops | AFPacketeth314 | 0
> 2504794:tcp.ssn_memcap_drop | AFPacketeth314 | 0
> 2504803:tcp.segment_memcap_drop | AFPacketeth314 | 0
> 2504809:capture.kernel_drops | AFPacketeth315 | 0
> 2504839:tcp.ssn_memcap_drop | AFPacketeth315 | 0
> 2504848:tcp.segment_memcap_drop | AFPacketeth315 | 0
> 2504854:capture.kernel_drops | AFPacketeth316 | 0
> 2504884:tcp.ssn_memcap_drop | AFPacketeth316 | 0
> 2504893:tcp.segment_memcap_drop | AFPacketeth316 | 0
>
> *pevman at suricata:~$ suricata --build-info*
> [10384] 1/12/2012 -- 14:28:44 - (suricata.c:560) <Info>
(SCPrintBuildInfo) -- This is Suricata version 1.4dev (rev 005f7a2)
> [10384] 1/12/2012 -- 14:28:44 - (suricata.c:633) <Info>
(SCPrintBuildInfo) -- Features: PCAP_SET_BUFF LIBPCAP_VERSION_MAJOR=1
PF_RING AF_PACKET HAVE_PACKET_FANOUT LIBCAP_NG LIBNET1.1
HAVE_HTP_URI_NORMALIZE_HOOK HAVE_HTP_TX_GET_RESPONSE_HEADERS_RAW HAVE_NSS
PROFILING
> [10384] 1/12/2012 -- 14:28:44 - (suricata.c:647) <Info>
(SCPrintBuildInfo) -- 64-bits, Little-endian architecture
> [10384] 1/12/2012 -- 14:28:44 - (suricata.c:649) <Info>
(SCPrintBuildInfo) -- GCC version 4.6.3, C version 199901
> [10384] 1/12/2012 -- 14:28:44 - (suricata.c:655) <Info>
(SCPrintBuildInfo) -- __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1
> [10384] 1/12/2012 -- 14:28:44 - (suricata.c:658) <Info>
(SCPrintBuildInfo) -- __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2
> [10384] 1/12/2012 -- 14:28:44 - (suricata.c:661) <Info>
(SCPrintBuildInfo) -- __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
> [10384] 1/12/2012 -- 14:28:44 - (suricata.c:664) <Info>
(SCPrintBuildInfo) -- __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8
> [10384] 1/12/2012 -- 14:28:44 - (suricata.c:667) <Info>
(SCPrintBuildInfo) -- __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16
> [10384] 1/12/2012 -- 14:28:44 - (suricata.c:671) <Info>
(SCPrintBuildInfo) -- compiled with -fstack-protector
> [10384] 1/12/2012 -- 14:28:44 - (suricata.c:677) <Info>
(SCPrintBuildInfo) -- compiled with _FORTIFY_SOURCE=2
> [10384] 1/12/2012 -- 14:28:44 - (suricata.c:680) <Info>
(SCPrintBuildInfo) -- compiled with libhtp 0.2.11, linked against 0.2.11
>
> pevman at suricata:~$ sudo grep -n "uptime"
/var/data/regit/log/suricata/stats.log | tail -4
> 2503442:Date: 12/1/2012 -- 14:27:56 (uptime: 0d, 18h 07m 04s)
> 2504174:Date: 12/1/2012 -- 14:28:15 (uptime: 0d, 18h 07m 23s)
> 2504906:Date: 12/1/2012 -- 14:28:34 (uptime: 0d, 18h 07m 42s)
> 2505638:Date: 12/1/2012 -- 14:28:53 (uptime: 0d, 18h 08m 01s)
>
> pevman at suricata:~$ sudo tcpstat -i eth3
> Time:1354365172 n=6106758 avg=984.85 stddev=663.77 bps=9622763462.40
> Time:1354365177 n=6126927 avg=981.51 stddev=663.29 bps=9621826076.80
> Time:1354365182 n=6110921 avg=984.19 stddev=662.02 bps=9622922160.00
> Time:1354365187 n=6126978 avg=981.50 stddev=662.38 bps=9621846648.00
> Time:1354365192 n=6109322 avg=984.46 stddev=661.25 bps=9623061092.80
> Time:1354365197 n=6146841 avg=978.24 stddev=662.73 bps=9620970840.00
> ^CTime:1354365202 n=112243 avg=982.41 stddev=663.97 bps=176430308.80
>
> pevman at suricata:~$ uname -a
> Linux suricata 3.2.0-30-generic #48-Ubuntu SMP Fri Aug 24 16:52:48 UTC
2012 x86_64 x86_64 x86_64 GNU/Linux
> pevman at suricata:~$
>
>
>
>
>
> hope it helps.
>
> thanks
>
> On Sat, Dec 1, 2012 at 3:54 AM, Martin Holste <mcholste at gmail.com
<mailto:mcholste at gmail.com> <mcholste at gmail.com>> wrote:
>
> Adjust your default timeouts much lower so that streams are taken out of
the connection pool more quickly.
>
> This config is aggressive, but I think you'll find it does the trick. If
it doesn't work, I'd like to know:
>
> flow-timeouts:
>
> default:
> new: 1 # 30
> established: 10 #300
> closed: 0
> emergency_new: 1 #10
> emergency_established: 1 #100
> emergency_closed: 0
> tcp:
> new: 1 #60
> established: 10 #3600
> closed: 0 #120
> emergency_new: 1 #10
> emergency_established: 5 #1 #300
> emergency_closed: 20
> udp:
> new: 1 #30
> established: 1 #300
> emergency_new: 1 #10
> emergency_established: 1 #100
> icmp:
> new: 1 #30
> established: 1 #300
> emergency_new: 1 #10
> emergency_established: 1 #100
>
>
>
>
> On Fri, Nov 30, 2012 at 4:15 PM, Dave Remien <dave.remien at gmail.com
<mailto:dave.remien at gmail.com> <dave.remien at gmail.com>> wrote:
>
> Fernando,
>
> If I'm reading your config file right, you're asking for 8.3 million
sessions of 512KB each? I think that works out to 4.3TB of RAM; rather more
than the 64GB memcap.
>
> Cheers,
>
> Dave
>
>
> On Fri, Nov 30, 2012 at 10:24 AM, Fernando Sclavo <fsclavo at gmail.com
<mailto:fsclavo at gmail.com> <fsclavo at gmail.com>> wrote:
>

Hello all!
I'm installing an IDS on our company, monitoring two core switches with
a sustained traffic of about 2gbps each. The server is a Dell R715, 32
cores, 192Gb RAM with two Intel X520 nics. Suricata version is 1.4b3.
The problem we are facing, is with tcp.segment_memcap_drop increasing
continuosly once time tcp.reassembly_memuse reaches their max size (64gb!!)
The related suricata.yaml stanza is:

stream:
  memcap: 24gb
  checksum-validation: no      # reject wrong csums
  inline: no                  # auto will use inline mode in IPS mode,
yes or no set it statically
  max-sessions: 8388608
  prealloc-sessions: 8388608
  reassembly:
    memcap: 64gb
    depth: 512kb                  # reassemble 1mb into a stream
    toserver-chunk-size: 2560
    toclient-chunk-size: 2560

Thanks in advance!

> _______________________________________________
> Suricata IDS Users mailing list: oisf-users at openinfosecfoundation.org
<mailto:oisf-users at openinfosecfoundation.org><oisf-users at openinfosecfoundation.org>
> Site: http://suricata-ids.org | Support: http://suricata-ids.org/support/
> List: https://lists.openinfosecfoundation.org/mailman/listinfo/oisf-users
> OISF: http://www.openinfosecfoundation.org/
>
>
>
>
> --
> ".... We are such stuff
> As dreams are made on; and our little life
> Is rounded with a sleep."
> -- Shakespeare, The Tempest - Act 4
>
>
> _______________________________________________
> Suricata IDS Users mailing list: oisf-users at openinfosecfoundation.org
<mailto:oisf-users at openinfosecfoundation.org><oisf-users at openinfosecfoundation.org>
> Site: http://suricata-ids.org | Support: http://suricata-ids.org/support/
> List: https://lists.openinfosecfoundation.org/mailman/listinfo/oisf-users
> OISF: http://www.openinfosecfoundation.org/
>
>
>
> _______________________________________________
> Suricata IDS Users mailing list: oisf-users at openinfosecfoundation.org
<mailto:oisf-users at openinfosecfoundation.org><oisf-users at openinfosecfoundation.org>
> Site: http://suricata-ids.org | Support: http://suricata-ids.org/support/
> List: https://lists.openinfosecfoundation.org/mailman/listinfo/oisf-users
> OISF: http://www.openinfosecfoundation.org/
>
>
>
>
> --
> Regards,
> Peter Manev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openinfosecfoundation.org/pipermail/oisf-users/attachments/20121204/a4bdcf36/attachment-0002.html>