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icmpcheck: Doesn't respect IPv4 DF=0, needed for NAT64/RFC6145 translation

3

Hi, when running the PMTU test on icmpcheck.popcount.org from a DNS64/NAT64 enabled network it seems to fail whether there is a PMTU problem or not. In such a network traffic...

DanielG

``` ~/dump/how-to-receive-a-packet$ ./build.sh udpclient.c:31:6: error: conflicting types for 'gettid' long gettid() { return syscall(SYS_gettid); } ^ /usr/include/x86_64-linux-gnu/bits/unistd_ext.h:34:16: note: previous declaration is here extern __pid_t gettid (void) __THROW; ^ udpclient.c:73:16: warning:...

minzak

In newer versions of bash (>5.1), you might encounter the error: line 37: printf: 0x00000000 00000000 00000000: invalid hex number I have added error handling. I also implemented a check...

zersh01