Dell PowerStore 5200T EMC PowerStore Host Configuration Guide - Page 60

Disabling Reverse Path Filtering, PowerStore Operating System 2.x and Later - Multi Subnet

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● Network Teaming - With Red Hat Enterprise Linux version 7, Network Teaming is offered as a new implementation of the bonding concept. The existing bonding driver is unaffected. Network Teaming is offered as an alternative and does not replace bonding in Red Hat Enterprise Linux version 7. For technical information about configuring Network Teaming, see Networking Guide: Configure Network Teaming. For a comparison between Bonding and Network Teaming implementations, see Networking Guide: Comparison of Network Teaming to Bonding. Disabling Reverse Path Filtering Use disabling reverse path filtering as a solution to the single network subnet limitation. Red Hat Enterprise Linux versions 6 and later 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, see the Root Cause section of this article to understand what it does and review alternative solutions as explained in RedHat Knowledge Article 53031 (When RHEL has multiple IPs...). 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.p2p1.rp_filter = 2 net.ipv4.conf.p2p2.rp_filter = 2 NOTE: In this example, p2p1 and p2p2 are the network interfaces used for iSCSI. Ensure to change 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 = 0 net.ipv4.conf.em1.rp_filter = 0 net.ipv4.conf.em2.rp_filter = 0 net.ipv4.conf.em3.rp_filter = 0 net.ipv4.conf.em4.rp_filter = 0 net.ipv4.conf.lo.rp_filter = 0 net.ipv4.conf.p2p1.rp_filter = 0 net.ipv4.conf.p2p2.rp_filter = 0 PowerStore Operating System 2.x and Later - Multi Subnet About this task Use this procedure for configuring the iSCSI adapter on Linux hosts connected to PowerStore with a PowerStore operating system version 2.0 (or later), in which up to 32 network subnets are supported. For further details, see the Linux documentation for the Linux version that is installed on the Linux hosts. Steps 1. Dell recommends creating four target iSCSI IP addresses (two per node), on two different subnets/VLANs. 2. Configure two iSCSI interfaces on the same subnet as each of the storage cluster iSCSI portals. NOTE: It is highly recommended not to use routing on iSCSI. Example: 60 Host Configuration for Linux

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●
Network Teaming - With Red Hat Enterprise Linux version 7, Network Teaming is offered as a new implementation of the
bonding concept. The existing bonding driver is unaffected.
Network Teaming is offered as an alternative and does not replace bonding in Red Hat Enterprise Linux version 7. For
technical information about configuring Network Teaming, see
Networking Guide: Configure Network Teaming
.
For a comparison between Bonding and Network Teaming implementations, see
Networking Guide: Comparison of Network
Teaming to Bonding
.
Disabling Reverse Path Filtering
Use disabling reverse path filtering as a solution to the single network subnet limitation.
Red Hat Enterprise Linux versions 6 and later 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, see the Root Cause section of this article to understand what it does and review
alternative solutions as explained in
RedHat Knowledge Article 53031 (When RHEL has multiple IPs...)
.
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.p2p1.rp_filter = 2
net.ipv4.conf.p2p2.rp_filter = 2
NOTE:
In this example,
p2p1
and
p2p2
are the network interfaces used for iSCSI. Ensure to change 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 = 0
net.ipv4.conf.em1.rp_filter = 0
net.ipv4.conf.em2.rp_filter = 0
net.ipv4.conf.em3.rp_filter = 0
net.ipv4.conf.em4.rp_filter = 0
net.ipv4.conf.lo.rp_filter = 0
net.ipv4.conf.p2p1.rp_filter = 0
net.ipv4.conf.p2p2.rp_filter = 0
PowerStore Operating System 2.x and Later - Multi Subnet
About this task
Use this procedure for configuring the iSCSI adapter on Linux hosts connected to PowerStore with a PowerStore operating
system version 2.0 (or later), in which up to 32 network subnets are supported. For further details, see the Linux documentation
for the Linux version that is installed on the Linux hosts.
Steps
1.
Dell recommends creating four target iSCSI IP addresses (two per node), on two different subnets/VLANs.
2.
Configure two iSCSI interfaces on the same subnet as each of the storage cluster iSCSI portals.
NOTE:
It is highly recommended not to use routing on iSCSI.
Example:
60
Host Configuration for Linux