[SunHELP] ping a port

Fri Sep 21 09:06:53 CDT 2001

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I had read that and came to that conclusion.  But, what on earth does
AFAIK mean? This is the 3rd or 4th time I've seen that.
Dave
=20
-----Original Message-----
From: Adam Kropelin [mailto:Adam.Kropelin at netlinkaccess.com]=20
Sent: Friday, September 21, 2001 7:05 AM
To: 'sunhelp at sunhelp.org'
Subject: RE: [SunHELP] ping a port
=20
AFAIK, there is no such thing as a port in ICMP. ICMP packets are
demultiplexed by IP based on the value of the protocol field in the IP
header. The network stack is what responds to a PING (really an ICMP
echo request packet), not any particular application.
--Adam=20
> -----Original Message-----=20
> From: Thomas Cameron [mailto:archimage at linux-magic.com]=20
> Sent: Friday, September 21, 2001 9:35 AM=20
> To: sunhelp at sunhelp.org=20
> Subject: Re: [SunHELP] ping a port=20
>=20
>=20
> I don't think ping can hit any port other than the standard=20
> ICMP port that it queries.=20
>=20
> Thomas=20
> ----- Original Message -----=20
> From: "David Baldwin" <dbaldwin at networkinsight.com>=20
> To: <sunhelp at sunhelp.org>=20
> Sent: Thursday, September 20, 2001 12:55 PM=20
> Subject: [SunHELP] ping a port=20
>=20
>=20
> > Hi all,=20
> > I am trying to find out how I can ping an ip through a=20
> certain port on=20
> > a firewall.  As a test I tried to telnet to the port on the system=20
> > with "telnet x.x.x.x port#" and it failed.  But if I try=20
> "ping x.x.x.x=20
> > port#" it goes through.  ICMP is allowed on its default=20
> port but how=20
> > can I change the port it tries?=20
> >=20
> > This is for standard "service alive?" checking.=20
> >=20
> > Thanks for any suggestions.=20
> >=20
> > Dave Baldwin=20
> > _______________________________________________=20
> > SunHELP maillist  -  SunHELP at sunhelp.org=20
> > http://www.sunhelp.org/mailman/listinfo/sunhelp=20
> >=20
>=20
> _______________________________________________=20
> SunHELP maillist  -  SunHELP at sunhelp.org=20
> http://www.sunhelp.org/mailman/listinfo/sunhel> p=20
>=20

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I had read that and came to that
conclusion.  But, what on =
earth does
AFAIK mean? This is the 3rd or 4th time I’ve =
seen
that.<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Dave<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original =
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> Adam Kropelin
[mailto:Adam.Kropelin at netlinkaccess.com] <br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Friday, September =
21, 2001
7:05 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
'sunhelp at sunhelp.org'<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: [SunHELP] =
ping a port</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'><o:p> </o:p></span></font></p>

AFAIK, there is no such thing as a port in =
ICMP. ICMP
packets are demultiplexed by IP based on the value of the protocol field =
in the
IP header. The network stack is what responds to a PING (really an ICMP =
echo
request packet), not any particular =
application.<o:p></o:p>

<p style=3D'margin-left:.5in'><font size=3D2 face=3D"Times New =
Roman"><span
style=3D'font-size:10.0pt'>--Adam</span></font> <o:p></o:p></p>

<p style=3D'margin-left:.5in'><font size=3D2 face=3D"Times New =
Roman"><span
style=3D'font-size:10.0pt'>> -----Original Message-----</span></font> =
<br>
<font size=3D2><span style=3D'font-size:10.0pt'>> From: Thomas =
Cameron [<a
href=3D"mailto:archimage at linux-magic.com">mailto:archimage at linux-magic.co=
m</a>] </span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>> Sent: Friday, =
September 21,
2001 9:35 AM</span></font> <br>
<font size=3D2><span style=3D'font-size:10.0pt'>> To: =
sunhelp at sunhelp.org</span></font>
<br>
<font size=3D2><span style=3D'font-size:10.0pt'>> Subject: Re: =
[SunHELP] ping a
port</span></font> <br>
<font size=3D2><span style=3D'font-size:10.0pt'>> </span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>> </span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>> I don't think ping =
can hit any
port other than the standard </span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>> ICMP port that it =
queries.</span></font>
<br>
<font size=3D2><span style=3D'font-size:10.0pt'>> </span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>> =
Thomas</span></font> <br>
<font size=3D2><span style=3D'font-size:10.0pt'>> ----- Original =
Message -----</span></font>
<br>
<font size=3D2><span style=3D'font-size:10.0pt'>> From: "David
Baldwin" <dbaldwin at networkinsight.com></span></font> <br>
<font size=3D2><span style=3D'font-size:10.0pt'>> To: =
<sunhelp at sunhelp.org></span></font>
<br>
<font size=3D2><span style=3D'font-size:10.0pt'>> Sent: Thursday, =
September 20,
2001 12:55 PM</span></font> <br>
<font size=3D2><span style=3D'font-size:10.0pt'>> Subject: [SunHELP] =
ping a port</span></font>
<br>
<font size=3D2><span style=3D'font-size:10.0pt'>> </span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>> </span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>> > Hi =
all,</span></font> <br>
<font size=3D2><span style=3D'font-size:10.0pt'>> > I am trying to =
find out
how I can ping an ip through a </span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>> certain port on =
</span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>> > a =
firewall.  As a
test I tried to telnet to the port on the system </span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>> > with =
"telnet x.x.x.x
port#" and it failed.  But if I try </span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>> "ping x.x.x.x =
</span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>> > port#" it =
goes
through.  ICMP is allowed on its default </span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>> port but how =
</span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>> > can I change =
the port it
tries?</span></font> <br>
<font size=3D2><span style=3D'font-size:10.0pt'>> ></span></font> =
<br>
<font size=3D2><span style=3D'font-size:10.0pt'>> > This is for =
standard
"service alive?" checking.</span></font> <br>
<font size=3D2><span style=3D'font-size:10.0pt'>> ></span></font> =
<br>
<font size=3D2><span style=3D'font-size:10.0pt'>> > Thanks for any
suggestions.</span></font> <br>
<font size=3D2><span style=3D'font-size:10.0pt'>> ></span></font> =
<br>
<font size=3D2><span style=3D'font-size:10.0pt'>> > Dave =
Baldwin</span></font>
<br>
<font size=3D2><span style=3D'font-size:10.0pt'>> >
_______________________________________________</span></font> <br>
<font size=3D2><span style=3D'font-size:10.0pt'>> > SunHELP =
maillist 
-  SunHELP at sunhelp.org </span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>> > <a
href=3D"http://www.sunhelp.org/mailman/listinfo/sunhelp" =
target=3D"_blank">http://www.sunhelp.org/mailman/listinfo/sunhelp</a></sp=
an></font>
<br>
<font size=3D2><span style=3D'font-size:10.0pt'>> ></span></font> =
<br>
<font size=3D2><span style=3D'font-size:10.0pt'>> </span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>>
_______________________________________________</span></font> <br>
<font size=3D2><span style=3D'font-size:10.0pt'>> SunHELP =
maillist  - 
SunHELP at sunhelp.org </span></font><br>
<font size=3D2><span style=3D'font-size:10.0pt'>> <a
href=3D"http://www.sunhelp.org/mailman/listinfo/sunhel" =
target=3D"_blank">http://www.sunhelp.org/mailman/listinfo/sunhel</a>>
p</span></font> <br>
<font size=3D2><span style=3D'font-size:10.0pt'>> =
</span></font><o:p></o:p></p>

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