Linux Net-tools Source
Many still manage and troubleshoot various network configurations by using a combination of ifconfig, route, arp and netstat command-line tools, collectively known as net-tools. Originally rooted in the BSD TCP/IP toolkit, the net-tools was developed to configure network functionality of older Linux kernels.
Its development in the Linux community so far has ceased since 2001. Some Linux distros such as Arch Linux and CentOS/RHEL 7 have already deprecated net-tools, and others are to do so in favor of iproute2. Iproute2, which is another family of network configuration tools, emerged to replace the functionality of net-tools. While net-tools accesses and changes kernel network configurations via procfs (/proc) and ioctl system call, iproute2 communicates with the kernel via netlink socket interface.
The /proc interface is known to be more heavyweight than netlink interface. Putting performance aside, the user interface of iproute2 is more intuitive than that of net-tools. For example, network resources (e.g., link, IP address, route, tunnel, etc.) are aptly defined with 'object' abstraction, and you can manage different objects using consistant syntax. Most importantly, iproute2 has been under so far. If you are still using net-tools, it is time to switch to iproute2, especially if you want to catch up with the latest and greatest networking features of the Linux kernel.
ProteoWizard
Can I view the source code of netstat on my Linux machine?
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Chances are that there are many things you can do with iproute2, but cannot with net-tools, be it source-based routing, QoS, VLAN, bonding, bridges, etc. It's also worth noting that higher-level network configuration tools such as depend on iproute2.
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For those who want to make the switch, here is a round-up of net-tools vs. Iproute2 comparison. Show All Connected Network Interfaces The following commands show a list of all available network interfaces (whether or not they are active). With net-tools.
Biosig
Specifying the broadcast address is not really required when setting IP addresses with iproute-2. The examples given make iproute-2 syntax seem cumbersome when compared to net-tools. It's worth mentioning that iproute-2 enables use of advanced Linux network features such as source-based routing, QoS, dummy (virtual) interfaces and bridges. It's also worth mentioning that modern distributions promote the use of higher-level network configuration tools such as network manager, which made the move from laptops to servers as far back as the release of RHEL6.