Setup Guide

Network Teaming is offered as an alternative and does not replace bonding in Red Hat Enterprise Linux 7. For
additional technical information on configuring Network Teaming, refer to https://access.redhat.com/documentation/en-
us/red_hat_enterprise_linux/7/html/networking_guide/ch-configure_network_teaming.
For a comparison between Bonding and Network Teaming implementations, refer to https://access.redhat.com/
documentation/en-us/red_hat_enterprise_linux/7/html/networking_guide/sec-comparison_of_network_teaming_to_bonding.
Disabling Reverse Path Filtering
This topic outlines disabling reverse path filtering as a solution to the single network subnet limitation.
RHEL 6 and above are configured by default to apply Strict Reverse Path Forwarding filtering recommended in RFC 3704 -
Ingress Filtering for Multihomed Networks.
NOTE: Before making this change, refer to the Root Cause section of this article to understand what it does and review
alternative solutions as explained in https://access.redhat.com/solutions/53031.
Setting the Reverse Path Filtering to 2 (loose) on the relevant network interfaces makes them both accessible and routable.
To apply this change, add the following lines to /etc/sysctl.conf:
net.ipv4.conf.eth2.rp_filter = 2
net.ipv4.conf.eth3.rp_filter = 2
NOTE: In this example, eth2 and eth3 are the network interfaces used for iSCSI. Make sure to modify to the relevant
interfaces.
To reload the configuration:
sysctl -p
To view the current Reverse Path Filtering configuration on the system:
sysctl -ar "\.rp_filter"
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.eth0.rp_filter = 1
net.ipv4.conf.eth1.rp_filter = 1
net.ipv4.conf.eth2.rp_filter = 2
net.ipv4.conf.eth3.rp_filter = 2
net.ipv4.conf.lo.rp_filter = 0
Multipathing Software Configuration
Configuring Linux Native Multipathing
For a PowerStore cluster to function properly with Linux hosts, configure the multipath settings file /etc/multipath.conf:
NOTE: If the host is connected to a cluster other than PowerStore, the configuration file may include additional devices.
NOTE: If the multipath.conf file includes a blacklist section, it should come before the devices section. For additional
information, refer to the Importing External Storage to PowerStore Guide document.
devices {
device
{
vendor DellEMC
product PowerStore
path_selector "queue-length 0"
path_grouping_policy group_by_prio
path_checker tur
detect_prio yes
Host Configuration for Linux
35