AIX - boot - nfs problem

Hello Experts,
I'm trying to boot my AIX server via network using another AIX as a boot server. I use tcpdump to monitor the process. After my boot client received .info file and mounted nfs resource (checked by 'showmount -a' from boot server) it hung. I noticed a lot of following entries:

11:28:52.078893 IP (tos 0x0, ttl  60, id 55081, offset 0, flags [DF], length: 152) 10.3.121.66.1356698857 > 10.3.121.40.2049: 112 getattr [|nfs]
11:28:52.079192 IP (tos 0x0, ttl  60, id 55082, offset 0, flags [DF], length: 152) 10.3.121.66.1356698858 > 10.3.121.40.2049: 112 getattr [|nfs]
11:28:52.089877 IP (tos 0x0, ttl  60, id 55083, offset 0, flags [DF], length: 152) 10.3.121.66.1356698859 > 10.3.121.40.2049: 112 getattr [|nfs]
11:28:52.091572 IP (tos 0x0, ttl  60, id 55084, offset 0, flags [DF], length: 152) 10.3.121.66.1356698860 > 10.3.121.40.2049: 112 getattr [|nfs]
11:28:52.091873 IP (tos 0x0, ttl  60, id 55085, offset 0, flags [DF], length: 152) 10.3.121.66.1356698861 > 10.3.121.40.2049: 112 getattr [|nfs]
11:28:52.145286 IP (tos 0x0, ttl  60, id 55086, offset 0, flags [DF], length: 40) 10.3.121.66.32768 > 10.3.121.40.2049: . [tcp sum ok] ack 307169 win 65535

11:31:14.541797 IP (tos 0x0, ttl  60, id 56396, offset 0, flags [DF], length: 152) 10.3.121.66.1356699988 > 10.3.121.40.2049: 112 getattr [|nfs]
11:31:14.557572 IP (tos 0x0, ttl  60, id 56397, offset 0, flags [DF], length: 40) 10.3.121.66.32768 > 10.3.121.40.2049: . [tcp sum ok] ack 437901 win 65535

Any suggestion? What do these entries mean?

regards,
Jarek