Snort mailing list archives
Re: Snort not seeing IP-traffic, just Ether/Other
From: "Kim.Halavakoski () Crosskey fi" <Kim.Halavakoski () Crosskey fi>
Date: Thu, 18 Apr 2013 20:36:23 +0000
Hello all, the position of the NIC is not the issue, the box has 2 interfaces and the other is used for management traffic. I would notice if I'd mixed up those two. The box is not virtualized, running on plain hardware. I tried setting the stuff with ethtool, here are the settings currently set / shown by ethtool: [root@xxxanal01 ]# ethtool -k eth1 Features for eth1: rx-checksumming: off tx-checksumming: off scatter-gather: off tcp-segmentation-offload: off udp-fragmentation-offload: off generic-segmentation-offload: off generic-receive-offload: off large-receive-offload: off rx-vlan-offload: on tx-vlan-offload: on ntuple-filters: off receive-hashing: off Also, any VLAN action going on? Yes, thre should be and are VLANs on the span port(Windows 7 sees them...) but for some reason the VLAN traffic is not seen by this box with the current configuration and OS.. Finally, I am getting traffic on the interface it seems, rx_octets, rx_ucast_packets, rx_mcast_packets and rx_bcast_traffics stats are increasing: [root@cbslprdanal01 khalavak]# ethtool -S eth1 NIC statistics: rx_octets: 1127183878 rx_fragments: 0 rx_ucast_packets: 5659825 rx_mcast_packets: 222 rx_bcast_packets: 544 rx_fcs_errors: 0 rx_align_errors: 0 rx_xon_pause_rcvd: 0 rx_xoff_pause_rcvd: 0 rx_mac_ctrl_rcvd: 0 rx_xoff_entered: 0 rx_frame_too_long_errors: 0 rx_jabbers: 0 rx_undersize_packets: 0 rx_in_length_errors: 0 rx_out_length_errors: 0 rx_64_or_less_octet_packets: 0 rx_65_to_127_octet_packets: 0 rx_128_to_255_octet_packets: 0 rx_256_to_511_octet_packets: 0 rx_512_to_1023_octet_packets: 0 rx_1024_to_1522_octet_packets: 0 rx_1523_to_2047_octet_packets: 0 rx_2048_to_4095_octet_packets: 0 rx_4096_to_8191_octet_packets: 0 rx_8192_to_9022_octet_packets: 0 tx_octets: 0 tx_collisions: 0 tx_xon_sent: 0 tx_xoff_sent: 0 tx_flow_control: 0 tx_mac_errors: 0 tx_single_collisions: 0 tx_mult_collisions: 0 tx_deferred: 0 tx_excessive_collisions: 0 tx_late_collisions: 0 tx_collide_2times: 0 tx_collide_3times: 0 tx_collide_4times: 0 tx_collide_5times: 0 tx_collide_6times: 0 tx_collide_7times: 0 tx_collide_8times: 0 tx_collide_9times: 0 tx_collide_10times: 0 tx_collide_11times: 0 tx_collide_12times: 0 tx_collide_13times: 0 tx_collide_14times: 0 tx_collide_15times: 0 tx_ucast_packets: 0 tx_mcast_packets: 0 tx_bcast_packets: 0 tx_carrier_sense_errors: 0 tx_discards: 0 tx_errors: 0 dma_writeq_full: 0 dma_write_prioq_full: 0 rxbds_empty: 0 rx_discards: 0 rx_errors: 0 rx_threshold_hit: 0 dma_readq_full: 0 dma_read_prioq_full: 0 tx_comp_queue_full: 0 ring_set_send_prod_index: 0 ring_status_update: 0 nic_irqs: 0 nic_avoided_irqs: 0 nic_tx_threshold_hit: 0 mbuf_lwm_thresh_hit: 0 [root@cbslprdanal01 khalavak]# ethtool -S eth1 NIC statistics: rx_octets: 1135510993 rx_fragments: 0 rx_ucast_packets: 5710822 rx_mcast_packets: 224 rx_bcast_packets: 549 <CUT THE REST> Still at loss wit this...counters are increasing, traffic seems to be there but IP-traffic is not seen by snort or tcpdump. Best regards, Kim Halavakoski Chief Security Officer Tel N°+358 [0] 204 291 187 Mob N°+358 [0] 40 702 7844 PGP S°: 0BFA A910 9AA7 94A5 A323 53F5 4151 4CE4 33BE 35FA kim.halavakoski () crosskey fi Crosskey Elverksgatan 10 AX-22 100 Mariehamn, Åland Tel N°+358 [0] 204 29 022 www.crosskey.fi On 04/18/2013 09:52 PM, James Lay wrote:
On 2013-04-18 12:01, Kim.Halavakoski () Crosskey fi wrote:Hello, I have setup a snort-sensor on a RedHat Linux box with traffic from a switch span-port feeding eth1 on the box. The traffic contains vlan-tagged traffic, if that makes any difference. The problem is that I am just getting some weird multicast / SSAP and DSAP encapsulated Ethernet frames on that interface on the Linux box, but when a colleague plugged in his laptop with Windows 7 on the same port it saw all the traffic that I would like to see, meaning IP-traffic from the monitored networks. So Windows 7 sees the traffic, but the Linux box running snort just sees weird multicast / SSAP / DSAP traffic. tcpdump does not show any IP traffic either. I know this is probably not a snort-question per se, but being snort-users list I think some of you guys might have som good insights to this behaviour, probably easy to fix but I just can't get it right now :( Any ideas on what I am doing wrong here?Best regards, Kim HalavakoskiDoesn't seem like your span-port is working..you should at least see broadcast though...that's weird. Try setting your nic offloading (as root and with ethtool installed): ethtool -K eth1 rx off ethtool -K eth1 tx off ethtool -K eth1 sg off ethtool -K eth1 tso off ethtool -K eth1 gso off ethtool -K eth1 gro off Also, any VLAN action going on? James ------------------------------------------------------------------------------ Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis & visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://sourceforge.net/mailarchive/forum.php?forum_name=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news!
------------------------------------------------------------------------------ Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis & visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://sourceforge.net/mailarchive/forum.php?forum_name=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news!
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- Re: Snort not seeing IP-traffic, just Ether/Other Glenn Geller (Apr 18)
- Re: Snort not seeing IP-traffic, just Ether/Other James Lay (Apr 18)
- Re: Snort not seeing IP-traffic, just Ether/Other Kim.Halavakoski () Crosskey fi (Apr 18)
- Re: Snort not seeing IP-traffic, just Ether/Other Eoin Miller (Apr 18)
- Re: Snort not seeing IP-traffic, just Ether/Other Tony Robinson (Apr 18)
- Re: Snort not seeing IP-traffic, just Ether/Other Kim.Halavakoski () Crosskey fi (Apr 18)
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- Re: Snort Start up error Said Nurhussein (Apr 19)