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HP-UX patches to fix packet capture problems
Note that packet-capture programs such as tcpdump may, on HP-UX, not be
able to see packets sent from the machine on which they're running.
Some articles on groups.google.com discussing this are:
http://groups.google.com/groups?selm=82ld3v%2480i%241%40mamenchi.zrz.TU-Berlin.DE
which says:
Newsgroups: comp.sys.hp.hpux
Subject: Re: Did someone made tcpdump working on 10.20 ?
Date: 12/08/1999
From: Lutz Jaenicke <jaenicke@emserv1.ee.TU-Berlin.DE>
In article <82ks5i$5vc$1@news1.dti.ne.jp>, mtsat <mtsat@iris.dti.ne.jp>
wrote:
>Hello,
>
>I downloaded and compiled tcpdump3.4 a couple of week ago. I tried to use
>it, but I can only see incoming data, never outgoing.
>Someone (raj) explained me that a patch was missing, and that this patch
>must me "patched" (poked) in order to see outbound data in promiscuous mode.
>Many things to do .... So the question is : did someone has already this
>"ready to use" PHNE_**** patch ?
Two things:
1. You do need a late "LAN products cumulative patch" (e.g. PHNE_18173
for s700/10.20).
2. You must use
echo 'lanc_outbound_promisc_flag/W1' | /usr/bin/adb -w /stand/vmunix /dev/kmem
You can insert this e.g. into /sbin/init.d/lan
Best regards,
Lutz
and
http://groups.google.com/groups?selm=88cf4t%24p03%241%40web1.cup.hp.com
which says:
Newsgroups: comp.sys.hp.hpux
Subject: Re: tcpdump only shows incoming packets
Date: 02/15/2000
From: Rick Jones <foo@bar.baz.invalid>
Harald Skotnes <harald@cc.uit.no> wrote:
> I am running HPUX 11.0 on a C200 hanging on a 100Mb switch. I have
> compiled libpcap-0.4 an tcpdump-3.4 and it seems to work. But at a
> closer look I only get to see the incoming packets not the
> outgoing. I have tried tcpflow-0.12 which also uses libpcap and the
> same thing happens. Could someone please give me a hint on how to
> get this right?
Search/Read the archives ?-)
What you are seeing is expected, un-patched, behaviour for an HP-UX
system. On 11.00, you need to install the latest lancommon/DLPI
patches, and then the latest driver patch for the interface(s) in use.
At that point, a miracle happens and you should start seeing outbound
traffic.
[That article also mentions the patch that appears below.]
and
http://groups.google.com/groups?selm=38AA973E.96BE7DF7%40cc.uit.no
which says:
Newsgroups: comp.sys.hp.hpux
Subject: Re: tcpdump only shows incoming packets
Date: 02/16/2000
From: Harald Skotnes <harald@cc.uit.no>
Rick Jones wrote:
...
> What you are seeing is expected, un-patched, behaviour for an HP-UX
> system. On 11.00, you need to install the latest lancommon/DLPI
> patches, and then the latest driver patch for the interface(s) in
> use. At that point, a miracle happens and you should start seeing
> outbound traffic.
Thanks a lot. I have this problem on several machines running HPUX
10.20 and 11.00. The machines where patched up before y2k so did not
know what to think. Anyway I have now installed PHNE_19766,
PHNE_19826, PHNE_20008, PHNE_20735 on the C200 and now I can see the
outbound traffic too. Thanks again.
(although those patches may not be the ones to install - there may be
later patches).
And another message to tcpdump-workers@tcpdump.org, from Rick Jones:
Date: Mon, 29 Apr 2002 15:59:55 -0700
From: Rick Jones
To: tcpdump-workers@tcpdump.org
Subject: Re: [tcpdump-workers] I Can't Capture the Outbound Traffic
...
http://itrc.hp.com/ would be one place to start in a search for the most
up-to-date patches for DLPI and the lan driver(s) used on your system (I
cannot guess because 9000/800 is too generic - one hs to use the "model"
command these days and/or an ioscan command (see manpage) to guess what
the drivers (btlan[3456], gelan, etc) might be involved in addition to
DLPI.
Another option is to upgrade to 11i as outbound promiscuous mode support
is there in the base OS, no patches required.
Another posting:
http://groups.google.com/groups?selm=7d6gvn%24b3%241%40ocean.cup.hp.com
indicates that you need to install the optional STREAMS product to do
captures on HP-UX 9.x:
Newsgroups: comp.sys.hp.hpux
Subject: Re: tcpdump HP/UX 9.x
Date: 03/22/1999
From: Rick Jones <foo@bar.baz>
Dave Barr (barr@cis.ohio-state.edu) wrote:
: Has anyone ported tcpdump (or something similar) to HP/UX 9.x?
I'm reasonably confident that any port of tcpdump to 9.X would require
the (then optional) STREAMS product. This would bring DLPI, which is
what one uses to access interfaces in promiscuous mode.
I'm not sure that HP even sells the 9.X STREAMS product any longer,
since HP-UX 9.X is off the pricelist (well, maybe 9.10 for the old 68K
devices).
Your best bet is to be up on 10.20 or better if that is at all
possible. If your hardware is supported by it, I'd go with HP-UX 11.
If you want to see the system's own outbound traffic, you'll never get
that functionality on 9.X, but it might happen at some point for 10.20
and 11.X.
rick jones
(as per other messages cited here, the ability to see the system's own
outbound traffic did happen).
Rick Jones reports that HP-UX 11i needs no patches for outbound
promiscuous mode support.
An additional note, from Jost Martin, for HP-UX 10.20:
Q: How do I get ethereral on HPUX to capture the _outgoing_ packets
of an interface
A: You need to get PHNE_20892,PHNE_20725 and PHCO_10947 (or
newer, this is as of 4.4.00) and its dependencies. Then you can
enable the feature as descibed below:
Patch Name: PHNE_20892
Patch Description: s700 10.20 PCI 100Base-T cumulative patch
To trace the outbound packets, please do the following
to turn on a global promiscuous switch before running
the promiscuous applications like snoop or tcpdump:
adb -w /stand/vmunix /dev/mem
lanc_outbound_promisc_flag/W 1
(adb will echo the result showing that the flag has
been changed)
$quit
(Thanks for this part to HP-support, Ratingen)
The attached hack does this and some security-related stuff
(thanks to hildeb@www.stahl.bau.tu-bs.de (Ralf Hildebrandt) who
posted the security-part some time ago)
<<hack_ip_stack>>
(Don't switch IP-forwarding off, if you need it !)
Install the hack as /sbin/init.d/hacl_ip_stack (adjust
permissions !) and make a sequencing-symlink
/sbin/rc2.d/S350hack_ip_stack pointing to this script.
Now all this is done on every reboot.
Here's the "hack_ip_stack" script:
-----------------------------------Cut Here-------------------------------------
#!/sbin/sh
#
# nettune: hack kernel parms for safety
OKAY=0
ERROR=-1
# /usr/contrib/bin fuer nettune auf Pfad
PATH=/sbin:/usr/sbin:/usr/bin:/usr/contrib/bin
export PATH
##########
# main #
##########
case $1 in
start_msg)
print "Tune IP-Stack for security"
exit $OKAY
;;
stop_msg)
print "This action is not applicable"
exit $OKAY
;;
stop)
exit $OKAY
;;
start)
;; # fall through
*)
print "USAGE: $0 {start_msg | stop_msg | start | stop}" >&2
exit $ERROR
;;
esac
###########
# start #
###########
#
# tcp-Sequence-Numbers nicht mehr inkrementieren sondern random
# Syn-Flood-Protection an
# ip_forwarding aus
# Source-Routing aus
# Ausgehende Packets an ethereal/tcpdump etc.
/usr/contrib/bin/nettune -s tcp_random_seq 2 || exit $ERROR
/usr/contrib/bin/nettune -s hp_syn_protect 1 || exit $ERROR
/usr/contrib/bin/nettune -s ip_forwarding 0 || exit $ERROR
echo 'ip_block_source_routed/W1' | /usr/bin/adb -w /stand/vmunix /dev/kmem || exit $ERROR
echo 'lanc_outbound_promisc_flag/W 1' | adb -w /stand/vmunix /dev/mem || exit $ERROR
exit $OKAY
-----------------------------------Cut Here-------------------------------------
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