Can you help me figure out what's happening here?

[Barton Hodges <barton () gcmcomputers com>]

Hi, 

I just started using snort, and I am seeing alot of 
the following types of packets coming to/from one of our machines.

The machine runs DNS, SMTP, and SSH mostly visible to the outside.

Are these log entries typical?  Could anybody explain
them to me?  

What is the best method of finding out which process is
causing these types of packets?

Thanks for all the help.

[**] ICMP L3retriever Ping [**]
08/15/01-16:06:08.029593 219.171.139.23 -> 219.171.139.24
ICMP TTL:31 TOS:0x0 ID:32504 IpLen:20 DgmLen:60
Type:8  Code:0  ID:2046   Seq:2281  ECHO
41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50  ABCDEFGHIJKLMNOP
51 52 53 54 55 56 57 41 42 43 44 45 46 47 48 49  QRSTUVWABCDEFGHI

[**] MISC Large ICMP Packet [**]
08/15/01-16:54:40.265443 219.171.139.23 -> <other external ip>
ICMP TTL:255 TOS:0x0 ID:35085 IpLen:20 DgmLen:1500
Type:0  Code:0  ID:0  Seq:0  ECHO REPLY
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
<snip>

[**] SCAN Proxy attempt [**]
08/15/01-23:14:42.608117 219.171.139.23:62276 -> <other external
ip>:8080
TCP TTL:127 TOS:0x0 ID:17682 IpLen:20 DgmLen:48 DF
******S* Seq: 0x5DC7D9B6  Ack: 0x0  Win: 0x4000  TcpLen: 28
TCP Options (4) => MSS: 1460 NOP NOP SackOK 

[**] MISC TCP port 0 traffic [**]
08/15/01-20:58:09.809308 <other external ip> -> 219.171.139.23:25
TCP TTL:116 TOS:0x0 ID:51534 IpLen:20 DgmLen:44 DF
******S* Seq: 0x6775A66  Ack: 0x0  Win: 0x2000  TcpLen: 24
TCP Options (1) => MSS: 1460

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