2 Nics with 2 different Gateway
2 Nics with 2 different Gateway
Hello !
I followed a lot of tutorials on the internet trying to make 2 nics with two different gateways on the same CentOS 7 box without success. I really appreciate if you can help me to find out the problem !!!
My NICs configuration are:
ens160
TYPE="Ethernet"
BOOTPROTO="none"
NAME="ens160"
DEVICE="ens160"
ONBOOT="yes"
IPADDR="172.16.15.21"
PREFIX="24"
ens192
TYPE="Ethernet"
BOOTPROTO="none"
NAME="ens192"
DEVICE="ens192"
ONBOOT="yes"
IPADDR="172.16.21.217"
PREFIX="24"
I create 2 files with rules for interfaces:
[root@test network-scripts]# cat rule-ens160
from 172.16.15.0/24 table rt1
[root@test network-scripts]# cat rule-ens192
from 172.16.21.0/24 table rt2
Also create 2 files with route for interfaces:
[root@test network-scripts]# cat route-ens160
default via 172.16.15.254 table rt1
[root@test network-scripts]# cat route-ens192
default via 172.16.21.254 table rt2
[root@test network-scripts]# ip rule show
0: from all lookup local
32764: from 172.16.21.0/24 lookup rt2
32765: from 172.16.15.0/24 lookup rt1
32766: from all lookup main
32767: from all lookup default
[root@test network-scripts]# ip route show table rt1
default via 172.16.15.254 dev ens160
[root@test network-scripts]# ip route show table rt2
default via 172.16.21.254 dev ens192
[root@test ~]# ping -I ens160 8.8.8.8
PING 8.8.8.8 (8.8.8.8) from 172.16.15.21 ens160: 56(84) bytes of data.
^C
--- 8.8.8.8 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 999ms
[root@test ~]# ping -I ens192 8.8.8.8
PING 8.8.8.8 (8.8.8.8) from 172.16.21.217 ens192: 56(84) bytes of data.
^C
--- 8.8.8.8 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 999ms
To validate the network outside from CentOS 7 box I shut down ens192 and did all network configuration on ens160 file. Then the ping works good, same to ens160.
Can you guys give me some light what I'm doing wrong or what I didn`t ?
Thank you so much in advanced !!!
I followed a lot of tutorials on the internet trying to make 2 nics with two different gateways on the same CentOS 7 box without success. I really appreciate if you can help me to find out the problem !!!
My NICs configuration are:
ens160
TYPE="Ethernet"
BOOTPROTO="none"
NAME="ens160"
DEVICE="ens160"
ONBOOT="yes"
IPADDR="172.16.15.21"
PREFIX="24"
ens192
TYPE="Ethernet"
BOOTPROTO="none"
NAME="ens192"
DEVICE="ens192"
ONBOOT="yes"
IPADDR="172.16.21.217"
PREFIX="24"
I create 2 files with rules for interfaces:
[root@test network-scripts]# cat rule-ens160
from 172.16.15.0/24 table rt1
[root@test network-scripts]# cat rule-ens192
from 172.16.21.0/24 table rt2
Also create 2 files with route for interfaces:
[root@test network-scripts]# cat route-ens160
default via 172.16.15.254 table rt1
[root@test network-scripts]# cat route-ens192
default via 172.16.21.254 table rt2
[root@test network-scripts]# ip rule show
0: from all lookup local
32764: from 172.16.21.0/24 lookup rt2
32765: from 172.16.15.0/24 lookup rt1
32766: from all lookup main
32767: from all lookup default
[root@test network-scripts]# ip route show table rt1
default via 172.16.15.254 dev ens160
[root@test network-scripts]# ip route show table rt2
default via 172.16.21.254 dev ens192
[root@test ~]# ping -I ens160 8.8.8.8
PING 8.8.8.8 (8.8.8.8) from 172.16.15.21 ens160: 56(84) bytes of data.
^C
--- 8.8.8.8 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 999ms
[root@test ~]# ping -I ens192 8.8.8.8
PING 8.8.8.8 (8.8.8.8) from 172.16.21.217 ens192: 56(84) bytes of data.
^C
--- 8.8.8.8 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 999ms
To validate the network outside from CentOS 7 box I shut down ens192 and did all network configuration on ens160 file. Then the ping works good, same to ens160.
Can you guys give me some light what I'm doing wrong or what I didn`t ?
Thank you so much in advanced !!!
Re: 2 Nics with 2 different Gateway
Do you have NetworkManager.service in use (which is, by default) or network.service?
If you do have NM, do you have package NetworkManager-dispatcher-routing-rules?
If you do have NM, do you have package NetworkManager-dispatcher-routing-rules?
Re: 2 Nics with 2 different Gateway
Hello I'm using NetworkManager.
I have NetworkManager-dispatcher-routing-rules installed
Thank you for helping me.
Code: Select all
[root@test network-scripts]# systemctl status NetworkManager.service -l
● NetworkManager.service - Network Manager
Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2021-10-01 09:32:39 -03; 2min 58s ago
Docs: man:NetworkManager(8)
Main PID: 691 (NetworkManager)
CGroup: /system.slice/NetworkManager.service
└─691 /usr/sbin/NetworkManager --no-daemon
Oct 01 09:32:40 test NetworkManager[691]: <info> [1633091560.2363] device (ens192): Activation: successful, device activated.
Oct 01 09:32:40 test NetworkManager[691]: <info> [1633091560.2399] device (ens160): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'managed')
Oct 01 09:32:40 test NetworkManager[691]: <info> [1633091560.2407] device (ens160): state change: secondaries -> activated (reason 'none', sys-iface-state: 'managed')
Oct 01 09:32:40 test NetworkManager[691]: <info> [1633091560.2421] manager: NetworkManager state is now CONNECTED_LOCAL
Oct 01 09:32:40 test NetworkManager[691]: <info> [1633091560.2706] device (ens160): Activation: successful, device activated.
Oct 01 09:32:40 test NetworkManager[691]: <info> [1633091560.2723] manager: startup complete
Oct 01 09:32:40 test NetworkManager[691]: <warn> [1633091560.9038] ifcfg-rh: 'rule-' file is present; you will need to use a dispatcher script to apply these routes
Oct 01 09:32:40 test NetworkManager[691]: <warn> [1633091560.9065] ifcfg-rh: 'rule-' file is present; you will need to use a dispatcher script to apply these routes
Oct 01 09:32:41 test NetworkManager[691]: <warn> [1633091561.6095] ifcfg-rh: 'rule-' file is present; you will need to use a dispatcher script to apply these routes
Oct 01 09:32:41 test NetworkManager[691]: <warn> [1633091561.8213] ifcfg-rh: 'rule-' file is present; you will need to use a dispatcher script to apply these routes
[root@test network-scripts]#
Code: Select all
[root@test network-scripts]# yum install NetworkManager-dispatcher-routing-rules
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirror.nbtelecom.com.br
* extras: mirror.nbtelecom.com.br
* updates: mirror.nbtelecom.com.br
Package 1:NetworkManager-dispatcher-routing-rules-1.18.8-2.el7_9.noarch already installed and latest version
Nothing to do
Re: 2 Nics with 2 different Gateway
What do you get with plain ip ro show?
It could be that the main table is still used for something.
Furthermore, what is the route to link-local network? For example, how to send to 172.16.15.0/24? There is no route for that in rt1.
Oh, wait, your rules ... "from 172.16.15.0/24 lookup rt1", shouldn't it be from me, e.g. "from 172.16.15.21 lookup rt1"?
It could be that the main table is still used for something.
Furthermore, what is the route to link-local network? For example, how to send to 172.16.15.0/24? There is no route for that in rt1.
Oh, wait, your rules ... "from 172.16.15.0/24 lookup rt1", shouldn't it be from me, e.g. "from 172.16.15.21 lookup rt1"?
Re: 2 Nics with 2 different Gateway
I'm not sure If I did the right changes but:
cat rule-ens192
from 172.16.21.217 table rt2
to 172.16.21.217 table rt2
cat rule-ens160
from 172.16.15.21 table rt1
to 172.16.15.21 table rt1
ip ro show
172.16.15.0/24 dev ens160 proto kernel scope link src 172.16.15.21 metric 100
172.16.21.0/24 dev ens192 proto kernel scope link src 172.16.21.217 metric 101
ip rule show
0: from all lookup local
32762: from all to 172.16.15.21 lookup rt1
32763: from all to 172.16.21.217 lookup rt2
32764: from 172.16.15.21 lookup rt1
32765: from 172.16.21.217 lookup rt2
32766: from all lookup main
32767: from all lookup default
Still the same problem ! Any idea ?
Just to add CentOS version is:
cat /etc/redhat-release
CentOS Linux release 7.9.2009 (Core)
cat rule-ens192
from 172.16.21.217 table rt2
to 172.16.21.217 table rt2
cat rule-ens160
from 172.16.15.21 table rt1
to 172.16.15.21 table rt1
ip ro show
172.16.15.0/24 dev ens160 proto kernel scope link src 172.16.15.21 metric 100
172.16.21.0/24 dev ens192 proto kernel scope link src 172.16.21.217 metric 101
ip rule show
0: from all lookup local
32762: from all to 172.16.15.21 lookup rt1
32763: from all to 172.16.21.217 lookup rt2
32764: from 172.16.15.21 lookup rt1
32765: from 172.16.21.217 lookup rt2
32766: from all lookup main
32767: from all lookup default
Still the same problem ! Any idea ?
Just to add CentOS version is:
cat /etc/redhat-release
CentOS Linux release 7.9.2009 (Core)
Re: 2 Nics with 2 different Gateway
These two make no sense.
I would have something like:
Code: Select all
rule-ens160
from 172.16.15.21 table rt1 priority 32764
route-ens160
172.16.15.0/24 dev ens160 table rt1
default via 172.16.15.254 table rt1
Re: 2 Nics with 2 different Gateway
Hello !
It starts working after I changed these parameters:
And set the table like this:
Thank you for helping me.
It starts working after I changed these parameters:
Code: Select all
vi /etc/sysctl.conf
net.ipv4.conf.default.rp_filter = 2
net.ipv4.conf.all.rp_filter = 2
net.ipv4.ip_forward = 1
for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 >| $f ; done
Code: Select all
[root@test ~]# ip rule show
0: from all lookup local
32764: from all oif ens192 lookup test
32765: from all iif ens192 lookup test
32766: from all lookup main
32767: from all lookup default
Code: Select all
[root@test ~]# ip route show table test
default via 172.16.21.254 dev ens192
Re: 2 Nics with 2 different Gateway
Hello Experts,
Can you please share the configuration for my reference.
Incidentally, I had to have 2Nic's with 2 different gateways..
Followed this message, but couldn't acheived.
Can you please post the entire steps to achieve the same
Can you please share the configuration for my reference.
Incidentally, I had to have 2Nic's with 2 different gateways..
Followed this message, but couldn't acheived.
Can you please post the entire steps to achieve the same
Re: 2 Nics with 2 different Gateway
Hello experts,
Tried and the configuration is as follows...
cat ifcfg-em1
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
#DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=em1
UUID=5fc974a5-ed12-4bc2-a136-687aa27487d2
DEVICE=em1
ONBOOT=yes
IPADDR=10.70.1.63
PREFIX=24
IPV6_PRIVACY=no
GATEWAY=10.70.1.1
DNS1=10.70.1.9
DNS2=10.70.1.10
cat ifcfg-p3p1
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=p3p1
UUID=346ccb67-886a-472c-a133-62c6e41af815
DEVICE=p3p1
ONBOOT=yes
IPV6_PRIVACY=no
IPADDR=10.22.55.42
NETMASK=255.255.255.252
PREFIX=30
#DEFROUTE=yes
cat rule-em1
from 10.70.1.63 table rt1 priority 32764
cat rule-p3p1
from 10.22.55.42 table rt2 priority 32765
cat route-em1
10.70.1.0/24 dev em1 table rt1
default via 10.70.1.1 table rt1
cat route-p3p1
10.22.55.40/30 dev p3p1 table rt2
default via 10.22.55.41 table rt2
ip rule sh
0: from all lookup local
32764: from 10.70.1.63 lookup rt1
32765: from 10.22.55.42 lookup rt2
32766: from all lookup main
32767: from all lookup default
vi /etc/sysctl.conf
net.ipv4.conf.default.rp_filter = 2
net.ipv4.conf.all.rp_filter = 2
net.ipv4.ip_forward = 1
cat /etc/redhat-release
CentOS Linux release 7.7.1908 (Core)
for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 >| $f ; done
still am unable to configure.
Your advice is highly appreciated.
Tried and the configuration is as follows...
cat ifcfg-em1
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
#DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=em1
UUID=5fc974a5-ed12-4bc2-a136-687aa27487d2
DEVICE=em1
ONBOOT=yes
IPADDR=10.70.1.63
PREFIX=24
IPV6_PRIVACY=no
GATEWAY=10.70.1.1
DNS1=10.70.1.9
DNS2=10.70.1.10
cat ifcfg-p3p1
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=p3p1
UUID=346ccb67-886a-472c-a133-62c6e41af815
DEVICE=p3p1
ONBOOT=yes
IPV6_PRIVACY=no
IPADDR=10.22.55.42
NETMASK=255.255.255.252
PREFIX=30
#DEFROUTE=yes
cat rule-em1
from 10.70.1.63 table rt1 priority 32764
cat rule-p3p1
from 10.22.55.42 table rt2 priority 32765
cat route-em1
10.70.1.0/24 dev em1 table rt1
default via 10.70.1.1 table rt1
cat route-p3p1
10.22.55.40/30 dev p3p1 table rt2
default via 10.22.55.41 table rt2
ip rule sh
0: from all lookup local
32764: from 10.70.1.63 lookup rt1
32765: from 10.22.55.42 lookup rt2
32766: from all lookup main
32767: from all lookup default
vi /etc/sysctl.conf
net.ipv4.conf.default.rp_filter = 2
net.ipv4.conf.all.rp_filter = 2
net.ipv4.ip_forward = 1
cat /etc/redhat-release
CentOS Linux release 7.7.1908 (Core)
for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 >| $f ; done
still am unable to configure.
Your advice is highly appreciated.
Re: 2 Nics with 2 different Gateway
Experts,
please help
please help