What commands exactly cause a segmentation fault for you? A segmentation fault usually refers to some faulty behavior in code, but since you say they are caused by several programs it usually means that either the binaries themselves were corrupted on disk somehow or that your memory is faulty.
You should try to reinstall the concerned packages on your host (this could still work if the packages are cached or you have a redundant network interface that works). If "not able to lift it or make it take any ip" refers to ifupdown2, then e.g. use apt reinstall ifupdown2
should do the trick.
Otherwise, if this does not resolve your problems or you're unable to reach Internet in any way, try to reinstall the system or check for faulty hardware by running a hard drive test (e.g. SMART util) or a memory test (e.g. memtest) (even though the latter seems unlikely for me in the given scenario).