pwru VS fsmon

if you have a recent enough kernel, this change https://github.com/cilium/pwru/pull/148 means that it will print the reason the packet was dropped in the output - see https://lwn.net/Articles/885729/

There's a whole heap of reasons a packet can be dropped:

[pwru](https://github.com/cilium/pwru) is a fun new tool from the Cilium folks for tracing network packets in the kernel. Like tcpdump but it shows you the full path including kernel syscalls. Lets you debug much deeper than "when the packet gets to this port it gets dropped".

I recently came across another useful utility for debugging unexpected packet drops - PWRU[0] (Packet, Where Are You) by Cilium.

It uses eBPF to try to trace the path of the packet through the kernel. Haven't needed to use it yet, but it could have saved me a lot of trouble in the past.

[0]: https://github.com/cilium/pwru

I have got an iPad Mini 2 with iOS 12.5.5 and Cydia installed with unc0ver 8.0.2. I installed from Sam Bingner repo wget, git and curl. If I run wget http://www.columbia.edu/~fdc/sample.html, curl google.com or git clone https://github.com/nowsecure/fsmon.git the command stucks on. However wget 128.59.105.24:80/~fdc/sample.html works, but curl 128.59.105.24:80/~fdc/sample.html doesn't. I tested DNS with ping google.com and dig. It works.