problem with 'ping' command

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http://www.unix.com – Hi All, I'm testing ping command on two servers. [say A-->B and C--->D] A,B,C,D are servers From A-->B: ping -c 3 -p ff -s30720 <B IP-Addres> This works fine. From C-->D: ping -c 3 -p ff -s30720 <D IP-Addres> This is NOT working and 100% packe loss :( But if I use 8700 instead of 30720 for packet size '-s', then it works. Now, Kindly let me know which variable is restricting this packet size '-s' and how to increase it in AIX server?? Thanks in Advance. (HowTos)