How to set Do not Fragment flag (IP_DF) in C

Question

I want to set the Do not Fragment flag in the IP packet. Is there a way to do this using a function setsockopt()or using function flags sendto()?

Can I do this with “normal” sockets or do I need to use raw sockets and build the entire IP header myself by setting its offset-field to IP_DF(which is defined in ip.h)?

Answer 1

According to this page , you can set the parameter IP_DONTFRAGfor the IP layer using datagram sockets (UDP). This SO discussion points in the same direction.