03-18-2002
A possible solution is that while performing a single port scan you are getting a correct response from an "active" or open port.
Now under a full 65535 port scan you are pushing alot of packets! You hadn't stated your time frequency of datagram submittal...but with an educated guess......i'd say that you are pumping them out as quick as possible.
When a system is under a pretty heavy load...the stack gets a bit quirky. Thus the inconsistent recognitions.....i.e...a "filtered" state.
Especially when your only traversing a portion of your TCP/IP stack, and not the whole OSI model.
Have you reviewed RFC 793 (Transmission Control Protocol) for valid responses? I suggest capturing packets to verify your systems responses.
HTH.
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AECHO(1) General Commands Manual AECHO(1)
NAME
aecho - send AppleTalk Echo Protocol packets to network hosts
SYNOPSIS
aecho [ -c count ] ( address | nbpname )
DESCRIPTION
aecho repeatedly sends an Apple Echo Protocol (AEP) packet to the host specified by the given AppleTalk address or nbpname and reports
whether a reply was received. Requests are sent at the rate of one per second.
address is parsed by atalk_aton(3). nbpname is parsed by nbp_name(3). The nbp type defaults to `Workstation'.
When aecho is terminated, it reports the number of packets sent, the number of responses received, and the percentage of packets lost. If
any responses were received, the minimum, average, and maximum round trip times are reported.
EXAMPLE
Check to see if a particular host is up and responding to AEP packets:
example% aecho bloodsport
11 bytes from 8195.13: aep_seq=0. time=10. ms
11 bytes from 8195.13: aep_seq=1. time=10. ms
11 bytes from 8195.13: aep_seq=2. time=10. ms
11 bytes from 8195.13: aep_seq=3. time=10. ms
11 bytes from 8195.13: aep_seq=4. time=10. ms
11 bytes from 8195.13: aep_seq=5. time=9. ms
^C
----8195.13 AEP Statistics----
6 packets sent, 6 packets received, 0% packet loss
round-trip (ms) min/avg/max = 9/9/10
OPTIONS
-c count
Stop after count packets.
SEE ALSO
ping(1), atalk_aton(3), nbp_name(3), atalkd(8).
netatalk 1.2 17 Dec 1991 AECHO(1)