pg 8.3.0 unexpected sending network packet?

My local firewall came up with a warning about postgres wanting to send
a network packet and I'm wondering if anyone can shed some light on its
trying to do?

The only line in pg_hba.conf that's not commented is
host all all 127.0.0.1/32 trust

According to netstat -a, its only listening on 127.0.0.1:5432

The sender details matches to my computer.
129.180.49.84 is just another machine on the local network (not dhcp
server/dns server/wins server/default gateway)

--------- firewall message --------------
Parent Process : C:\Program Files\PostgreSQL\8.3\bin\postgres.exe
Parent Version : 8.3.0.831
Parent Description : PostgreSQL Server
Parent Process ID : 0xB8 (Heximal) 184 (Decimal)

File Version : 8.3.0.831
File Description : PostgreSQL Server (postgres.exe)
File Path : C:\Program Files\PostgreSQL\8.3\bin\postgres.exe
Process ID : 0xBA4 (Heximal) 2980 (Decimal)

Connection origin : local initiated
Protocol : Raw Ethernet
Local Address : 0.0.0.0
Local Port : 0
Remote Name :
Remote Address : 0.0.0.0
Remote Port : 0

Ethernet packet details:
Ethernet II (Packet Length: 56)
Destination: ff-ff-ff-ff-ff-ff
Source: 00-12-3f-e9-e8-49
Type: ARP (0x0806)
Address Resolution Protocol (ARP)
Hardware type: Ethernet (0x0001)
Protocol type: IP (0x0800)
Hardware size: 6
Protocol size: 4
Opcode: Request
Sender hardware address: 00-12-3f-e9-e8-49
Sender IP address: 129.180.49.116
Target hardware address: 00-00-00-00-00-00
Target IP address: 129.180.49.84

Binary dump of the packet:
0000: FF FF FF FF FF FF 00 12 : 3F E9 E8 49 08 06 00 01 | ........?..I....
0010: 08 00 06 04 00 01 00 12 : 3F E9 E8 49 81 B4 31 74 | ........?..I..1t
0020: 00 00 00 00 00 00 81 B4 : 31 54 30 4C 02 01 00 04 | ........1T0L....
0030: 06 70 75 62 6C 69 63 A0 : | .public.

--
Klint Gore
Database Manager
Sheep CRC
A.G.B.U.
University of New England
Armidale NSW 2350

Ph: 02 6773 3789
Fax: 02 6773 3266
EMail: kgore4(at)une(dot)edu(dot)au