Host Route:Do not add a static route to Ubuntu VM when nexthop IP is set to its own VM IP
Description
Environment
Activity
Arunkumar Murukesan April 5, 2018 at 6:46 AM
Tested with build - karaf-0.8.0-20180309.023057-1679:
-----------------------------------------------------
openstack subnet show SUBNET1
----------------------------------------------------------------------------+
Field | Value |
----------------------------------------------------------------------------+
allocation_pools | 10.10.10.2-10.10.10.254 |
cidr | 10.10.10.0/24 |
created_at | 2018-04-04T08:32:05Z |
description |
|
dns_nameservers |
|
enable_dhcp | True |
gateway_ip | 10.10.10.1 |
host_routes | destination='10.20.20.0/24', gateway='10.10.10.7' |
id | 56e1d700-abc3-46cc-98e6-642b72fa0e76 |
ip_version | 4 |
ipv6_address_mode | None |
ipv6_ra_mode | None |
name | SUBNET1 |
network_id | 9f6c07b0-97d3-4591-b4f6-0ce710777a99 |
project_id | b3a69510790c4f6a9e3aaa1428263087 |
revision_number | 6 |
segment_id | None |
service_types |
|
subnetpool_id | None |
tags |
|
updated_at | 2018-04-04T09:26:50Z |
use_default_subnet_pool | None |
----------------------------------------------------------------------------+
openstack subnet show SUBNET2
----------------------------------------------------------------------------+
Field | Value |
----------------------------------------------------------------------------+
allocation_pools | 10.20.20.2-10.20.20.254 |
cidr | 10.20.20.0/24 |
created_at | 2018-04-04T08:46:45Z |
description |
|
dns_nameservers |
|
enable_dhcp | True |
gateway_ip | 10.20.20.1 |
host_routes | destination='10.10.10.0/24', gateway='10.20.20.8' |
id | 847db728-46a6-4162-9e19-e953a5795e9d |
ip_version | 4 |
ipv6_address_mode | None |
ipv6_ra_mode | None |
name | SUBNET2 |
network_id | 0dae21a6-0185-4d82-8bbe-3d3745aa114d |
project_id | b3a69510790c4f6a9e3aaa1428263087 |
revision_number | 1 |
segment_id | None |
service_types |
|
subnetpool_id | None |
tags |
|
updated_at | 2018-04-04T09:07:44Z |
use_default_subnet_pool | None |
----------------------------------------------------------------------------+
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether fa:16:3e:42:78:11 brd ff:ff:ff:ff:ff:ff
inet 10.10.10.7/24 brd 10.10.10.255 scope global eth0
inet6 fe80::f816:3eff:fe42:7811/64 scope link
valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether fa:16:3e:cf:2b:ba brd ff:ff:ff:ff:ff:ff
inet 10.20.20.8/24 brd 10.20.20.255 scope global eth1
inet6 fe80::f816:3eff:fecf:2bba/64 scope link
valid_lft forever preferred_lft forever
$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.20.20.1 0.0.0.0 UG 0 0 0 eth1
0.0.0.0 10.10.10.1 0.0.0.0 UG 0 0 0 eth0
10.10.10.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
10.20.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
Problem description:
A static route is getting configured to Ubuntu VM when nexthop IP is set to its own VM IP. Due to this extra route in VM, traffic loss seen when trying to ping between different subnets.