Hi there. I have implemented a suricata solution in one interface. That interface is a mirrored WAN port. So all the traffic that i see is to the internet.
I want to monitor my internal traffic as well. Is it possible to add another interface on the suricata.yaml?
yes, you can write a second interface section like this:
af-packet:
- interface: eth0
<snip options>
-interface: eth1
Thanks. Imagining if the new interface is a mirred trunk port with all my VLANs.
Do i have to do something special or just define my networks on the yaml?
Just define the network in the yaml in the HOME_NET section, you might want to check the vlan use-for-tracking option and set it to yes.
Hello,
I need to implement two interfaces (bond0 and bond1).
RHEL 8.4
Suricata 6.0.3
I need to edit two files (/etc/sysconfig/suricata and/etc/suricata/suricata.yaml).
In “/etc/sysconfig/suricata” I have:
OPTIONS = “- i bond0 -i bond1”
In “/etc/suricata/suricata.yaml” I have:
# Linux high speed capture support
af-packet:
- interface: bond0
- interface: bond1
# Number of receive threads. "auto" uses the number of cores
#threads: auto
# Default clusterid. AF_PACKET will load balance packets based on flow.
cluster-id: 99
# Default AF_PACKET cluster type. AF_PACKET can load balance per flow or per hash.
# This is only supported for Linux kernel > 3.1
# possible value are:
# * cluster_flow: all packets of a given flow are sent to the same socket
# * cluster_cpu: all packets treated in kernel by a CPU are sent to the same socket
# * cluster_qm: all packets linked by network card to a RSS queue are sent to the same
# socket. Requires at least Linux 3.14.
# * cluster_ebpf: eBPF file load balancing. See doc/userguide/capture-hardware/ebpf-xdp.rst for
# more info.
# Recommended modes are cluster_flow on most boxes and cluster_cpu or cluster_qm on system
# with capture card using RSS (requires cpu affinity tuning and system IRQ tuning)
cluster-type: cluster_flow
# In some fragmentation cases, the hash can not be computed. If "defrag" is set
# to yes, the kernel will do the needed defragmentation before sending the packets.
defrag: yes
# To use the ring feature of AF_PACKET, set 'use-mmap' to yes
use-mmap: yes
# Lock memory map to avoid it being swapped. Be careful that over
# subscribing could lock your system
#mmap-locked: yes
# Use tpacket_v3 capture mode, only active if use-mmap is true
# Don't use it in IPS or TAP mode as it causes severe latency
tpacket-v3: yes
# Ring size will be computed with respect to "max-pending-packets" and number
# of threads. You can set manually the ring size in number of packets by setting
# the following value. If you are using flow "cluster-type" and have really network
# intensive single-flow you may want to set the "ring-size" independently of the number
# of threads:
#ring-size: 2048
# Block size is used by tpacket_v3 only. It should set to a value high enough to contain
# a decent number of packets. Size is in bytes so please consider your MTU. It should be
# a power of 2 and it must be multiple of page size (usually 4096).
#block-size: 32768
# tpacket_v3 block timeout: an open block is passed to userspace if it is not
# filled after block-timeout milliseconds.
#block-timeout: 10
# On busy systems, set it to yes to help recover from a packet drop
# phase. This will result in some packets (at max a ring flush) not being inspected.
#use-emergency-flush: yes
# recv buffer size, increased value could improve performance
# buffer-size: 32768
# Set to yes to disable promiscuous mode
# disable-promisc: no
# Choose checksum verification mode for the interface. At the moment
# of the capture, some packets may have an invalid checksum due to
# the checksum computation being offloaded to the network card.
# Possible values are:
# - kernel: use indication sent by kernel for each packet (default)
# - yes: checksum validation is forced
# - no: checksum validation is disabled
# - auto: Suricata uses a statistical approach to detect when
# checksum off-loading is used.
# Warning: 'capture.checksum-validation' must be set to yes to have any validation
#checksum-checks: kernel
# BPF filter to apply to this interface. The pcap filter syntax applies here.
#bpf-filter: port 80 or udp
# You can use the following variables to activate AF_PACKET tap or IPS mode.
# If copy-mode is set to ips or tap, the traffic coming to the current
# interface will be copied to the copy-iface interface. If 'tap' is set, the
# copy is complete. If 'ips' is set, the packet matching a 'drop' action
# will not be copied.
#copy-mode: ips
#copy-iface: eth1
# For eBPF and XDP setup including bypass, filter and load balancing, please
# see doc/userguide/capture-hardware/ebpf-xdp.rst for more info.
# Put default values here. These will be used for an interface that is not
# in the list above.
- interface: default
#threads: auto
use-mmap: yes
tpacket-v3: yes
It is right?
Thank you for your help
Michael
Change /etc/sysconfig/suricata – the option you want is --af-packet
The suricata.yaml file should change. Each interface should have it’s own options; minimally, the cluster-id should be unique for each interface.
This example is from our documentation at suricata.readthedocs.io You can use defaults for most of the options but make sure cluster-id is unique for all interfaces; you can comment out (or remove) the items you don’t need.
- interface: eth1
# Number of receive threads. "auto" uses the number of cores
threads: 18
cluster-id: 99
cluster-type: cluster_qm
defrag: no
use-mmap: yes
mmap-locked: yes
tpacket-v3: yes
ring-size: 100000
block-size: 1048576
- interface: eth1
# Number of receive threads. "auto" uses the number of cores
threads: 18
cluster-id: 99
cluster-type: cluster_qm
defrag: no
use-mmap: yes
mmap-locked: yes
tpacket-v3: yes
ring-size: 100000
block-size: 1048576