How to define IPv6 policy routing default route via NetworkManager?

Environment

• Red Hat Enterprise Linux 8
• IPv6
• Policy routing

Issue

• How to define IPv6 policy routing default route via NetworkManager?
• I have a route configuration file with the default route for a routing table like this, but it does not apply on boot:

route6-bond0
default via 2001::ff table 1

# ip -6 route show table 1
Error: ipv6: FIB table does not exist.
Dump terminated

Resolution

Add the route to the NetworkManager connection properties with:

nmcli con mod bond0 ipv6.routes "::/0 2001::ff table=1"

This results in the configuration:

# nmcli con show bond0 | grep ipv6.routes
ipv6.routes:                            { ip = ::/0, nh = 2001::ff table=1 }

Or on disk with:

# cat /etc/sysconfig/network-scripts/route6-bond0
::/0 via 2001::ff table 1

Diagnostic Steps

The FIB table does not exist is the expected result when a routing table has not been populated:

• RHEL8 throws “Error: ipv4: FIB table does not exist. Dump terminated” after executing ip route show table default

Define policy routes for NetworkManager like this:

• Is it possible to set up Policy Based Routing with NetworkManager in RHEL?

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