Why ip aliasing

We will be using a tool called 'nmtui' for this method. For this method, we will manually create the necessary files needed. If you think we have helped you or just want to support us, please consider these Connect to us: Facebook Twitter Google Plus. Become a Supporter - Donate us some of you hard earned money: [paypal-donation]. I want assign multiple ip to 1 NIC. A brief and comprehensive article on IP Aliasing. Security policies and defense against web and DDoS attacks.

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More ways to get started. Get started. Add networking features. Create firewall rules. Create firewall policies. Add IP addresses. Add alias IP ranges. Add routes. Configure VMs. Add VMs with multiple interfaces. Add capabilities. Shared VPC. VPC Network Peering. Access APIs and services.

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Legacy networks. Overview If you have only one service running on a VM, you can reference it using the interface's primary IP address. Alias IP ranges defined in a VM network interface Using IP aliasing, you can configure multiple internal IP addresses, representing containers or applications hosted in a VM, without having to define a separate network interface. A secondary CIDR range The VM primary IP Container architecture in Google Cloud Consider a scenario in which you want to configure containerized services on top of Google Cloud.

To create this configuration, do the following: When you create the subnet, you configure One primary CIDR range, for example, Configuring VMs with multiple alias IP ranges click to enlarge In order to configure this example, use the following gcloud commands: gcloud compute networks create vpc1 --subnet-mode custom gcloud compute networks subnets create subnet1 --region us-central1 --network vpc1 --range That is, if eth0 has two addresses You can also assign source addresses explicitly in this case by using the "src 1.

In your case, though, all your addresses are on the same subnet, so the "primary" one as revealed by "ip addr list dev eth0" is used as the source IP for traffic exiting on that interface. I think it's possible to control the source IPs in this case just using "ip route", but I've found it easier to use iptables to rewrite the source addresses for traffic of interest. If you want to force a specific source address to be used for specific destinations, you can do it with a SNAT rule:.

So if your "primary" eth0 IP is Note that the "-s It uses whatever the default gateway is in the routing table, unless there is a specific route telling it to use another: route -n. Since you are using passive mode and the client will always be initiating the connection, I think src ip field in the IP header will always appear as whatever IP the client connected to.

If it were active mode the server was initiating the connection, I think it would always be the 'Primary' IP. If your addresses are in the same subnet, Linux will make the first address you added 'Primary' and the others secondary. EDIT2: Okay, I wrote the above from the standpoint that you were running the server, so since you are the client and initiating the connection, I think it will always appear to come from the Primary IP address, but again, try it and see with tcpdump.

Unless your FTP job has a way of specifying the interface to use for connections, I believe it defaults to the first physical interface on the relevant subnet eth0 in this case. If you had a server with two NICs on different subnets, it'd figure out which interface to use based on the routing table. When establishing an outbound connection, your server will look in its routing table to determine which of your four interfaces to use; your TCP connections will have a source IP of your exit interface.

Will give you the output of your routing table; look for any specific entries matching the client IP you are trying to connect to. If none exist, then you will be using a default route 0. If you have multiple default routes, the one with the lowest cost will be the one used. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

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