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2 Gateways or Multiple Gateway on a single CentOS box

Rumi, May 21, 2015

Scenerio-

eth0- 172.30.0.100 | Gateway- 172.30.0.97

eth1- 192.168.2.247 | Gateway- 192.168.2.1

Need to connect to SIP BOX destination (fictitious)- 202.140.1.1

eth0 has not internet access but it uses the mentioned (172.30.0.97) as gateway to reach 202.140.1.1 server

eth0 has internet access by using 192.168.2.1 gateway.

Here goes the configuration on /etc/sysconfig/network-scripts/ifcfg-eth0

# Intel Corporation 82540EM Gigabit Ethernet Controller
DEVICE=eth0
BOOTPROTO=static
BROADCAST=172.30.0.103
DHCPCLASS=
HWADDR=08:00:27:E6:A6:62
IPADDR=172.30.0.100
NETMASK=255.255.255.248
NETWORK=172.30.0.96
ONBOOT=yes
ip route add 202.40.1.1/32 via 172.30.0.97

Here goes the configuration on /etc/sysconfig/network-scripts/ifcfg-eth1

# Intel Corporation 82540EM Gigabit Ethernet Controller
DEVICE=eth1
BOOTPROTO=static
BROADCAST=192.168.2.255
HWADDR=08:00:27:86:40:CD
IPADDR=192.168.2.247
NETMASK=255.255.255.0
NETWORK=192.168.2.0
ONBOOT=yes

Configuration on /etc/sysconfig/network

NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=16426
#GATEWAY=172.30.0.97
GATEWAY=192.168.2.1

Configuration on /etc/resolv.conf (Your DNS Server)-

#nameserver 8.8.8.8
nameserver 114.130.5.5
nameserver 114.130.5.6
Administrations Configurations (Linux) CentOSiprouteMultiple Gateway

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Myself…

Hi, I am Hasan T. Emdad Rumi, an IT Project Manager & Consultant, Virtualization & Cloud Computing and Public Key Infrastructure Savvy from Dhaka, Bangladesh. I have prior experience in managing numerous local and international projects in the area of Telco VAS & NMC, National Data Center & Naitonal PKI Root and Enterprise CA Infrastructure. Also engaged with several Offshore Software Development Team.

Worked with Orascom Telecom-Banglalink, Network Elites as VAS partner, BTRC, BTT (Turkey) , Mango Teleservices Limited and Access to Informaiton (A2I-UNDP) and at Oracle Corporation as Principal Technology Solution (Cloud) Architect.

And currently being employed at Huawei Technologies (Bangladesh) Ltd. as Advanced Business Development Lead (Cloud) in the south asia region.

You can reach me [h.t.emdad at gmail.com] and I will be delighted to exchange my views.

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