I came across this documentation with source code for providing network buffering to applications https://www.infradead.org/~tgr/libnl/doc/api/route_2qdisc_2plug_8c_source.html. This network-buffering helps output-commit problem when providing fault tolerance to virtual machines. The output is buffered until an acknowledgement arrives from the backup VM and then released to the external world. So that backup and primary VMs seem consistent externally. Initially developed for XEN VMM to provide fault tolerance to VMs and I think it's now available for QEMU too.
Where does the script reside which does network-buffering for checkpoints? and what are the commands to make this happen? I want to do this network-buffering for packets originating from an application. Is it possible to do it in the same way as above? Does it do any damage to the host kernel? Can I get a simple working example for this?
