Setting primary ip for outgoing CentOS connections?

R

r1der2017-01-14 02:29:29

linux

r1der, 2017-01-14 02:29:29

We have a dedicated server, one network port, 3 IP addresses, there are aliases
1 IP address from one subnet and 2 from another
For example

85.114.132.84
89.163.252.14
89.163.252.15

[[email protected] ~]# ifconfig -a
eth0 Link encap:Ethernet HWaddr 90:2B:34:A1:4B:53
inet addr:89.163.252.14 Bcast:89.163.252.255 Mask:255.255.255.0
inet6 addr: fe80::922b:34ff:fea1:4b53/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:21691 errors:0 dropped:0 overruns:0 frame:0
TX packets:4872 errors:1 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000 
RX bytes:2111154 (2.0 MiB) TX bytes:6388222 (6.0 MiB)

eth0:0 Link encap:Ethernet HWaddr 90:2B:34:A1:4B:53
inet addr:89.163.252.15 Bcast:89.163.252.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

eth0:1 Link encap:Ethernet HWaddr 90:2B:34:A1:4B:53
inet addr:85.114.132.84 Bcast:85.114.132.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

config files are configured to use configs from /etc/sysconfig/network-scripts

[[email protected] network-scripts]# cat ifcfg-eth0
DEVICE="eth0"
BOOTPROTO="static"
DNS1="8.8.8.8"
DNS2="8.8.4.4"
GATEWAY="85.114.132.1"
HWADDR="90:2B:34:A1:4B:53"
IPADDR="89.163.252.14"
IPV6INIT="yes"
NETMASK="255.255.255.0"
NM_CONTROLLED="no"
ONBOOT="yes"
TYPE="Ethernet"

[[email protected] network-scripts]# cat ifcfg-eth0:0
DEVICE="eth0:0"
BOOTPROTO="static"
GATEWAY="85.114.132.1"
IPADDR="89.163.252.15"
NETMASK="255.255.255.0"
NM_CONTROLLED="no"
ONBOOT="yes"

[[email protected] network-scripts]# cat ifcfg-eth0:1
DEVICE="eth0:1"
BOOTPROTO="static"
GATEWAY="85.114.132.1"
IPADDR="85.114.132.84"
NETMASK="255.255.255.0"
NM_CONTROLLED="no"
ONBOOT="yes"

routing table

[[email protected] ~]# ip r
85.114.132.0/24 dev eth0 proto kernel scope link src 85.114.132.84 
89.163.252.0/24 dev eth0 proto kernel scope link src 89.163.252.14 
169.254.0.0/16 dev eth0 scope link metric 1002 
default via 85.114.132.1 dev eth0 src 85.114.132.84

The default IP address for outgoing connections is always 85.114.132.84
How can this be fixed if we assume that the server makes outgoing connections through 89.163.252.14 or 89.163.252.15 ??
Forced

sudo ip route change default via 85.114.132.1 dev eth0 src 89.163.252.14

gives the desired result only until the reboot
I played with defroute - it did not give a result
How to do it right?

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[[+comments_count]] answer(s)

S

Saenara, 2017-01-14
@r1der

Centos is not available to check, but, it seems to me, something like this:
1. Remove GATEWAY is all ifcfg-eth0*
2. Create a file /etc/network-scripts/route-eth0:1 and enter there:

default via 85.114.132.1 dev eth0 src 89.163.252.14

A

Alexander, 2017-01-14
@asand3r

See file /etc/sysconfig/network.
Try adding to it:
GATEWAY=89.163.252.14