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How do I increase the TTL on a socket?

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Contributed by c-era on May 12, 2000 at 21:42 UTC
Q&A  > network programming


Description:

I have to write an ICMP program, and the TTL is 1. Does anyone know how to change the TTL?
use Socket; $host="somehost"; socket(SOCK,PF_INET, SOCK_RAW, getprotobyname('icmp')) || die $!; send (SOCK, pack("C2 S5", 17, 0, 0xc898,0x2667,0,0,0), 0x04,sockaddr_i +n (0,inet_aton($host)) ) || die $!;

Answer: How do I increase the TTL on a socket?
contributed by c-era

I found my own answer:

use Socket; $host="somehost"; socket(SOCK,PF_INET, SOCK_RAW, getprotobyname('icmp')) || die $!; send (SOCK, pack("C2 S5", 17, 0, 0xc898,0x2667,0,0,0),0,sockaddr_in (0 +,inet_aton($host))) || die $!; ^
The flag was just set wrong, I also found out how to change the TTL (at least for Solaris):
setsockopt (SOCK,0,4,<TTL>);

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