[SunHELP] ping a port

Fri Sep 21 09:09:06 CDT 2001

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As long as the service you want to check handles TCP connections, TELNET
should be all you need. I regularly TELNET to my web and mail ports when I
need to check that they are alive. Pick your favorite web site, telnet to
port 80 and type something like "GET stuff.html" and you'll get a nice 404
HTML page back. Obviously if the firewall blocks access to that port, you're
not going to get through, but neither will anyone else including actual
client programs.

--Adam

> -----Original Message-----
> From: David Baldwin [mailto:dbaldwin at networkinsight.com] 
> Sent: Friday, September 21, 2001 10:00 AM
> To: sunhelp at sunhelp.org
> Subject: RE: [SunHELP] ping a port
> 
> 
> What I need to be able to do is check if a service's port is 
> responding such as 80 or 443.  And, I need to be able to do 
> it through a firewall. I have seen that ping is not the tool 
> for that and port scanners might do the trick.  My next 
> question is this, if I run a port scan is it going to let me 
> know if the firewall is open or can it tell me if a port on 
> the server on the other side is open and responding as well?  
> Also, does Solaris come with any such tool?  I have heard of 
> tools like nmap and netcat and they are available from sunfreeware.
> 
> Thanks, once again, for any suggestions.
> Dave Baldwin
> 
> -----Original Message-----
> From: Thomas Cameron [mailto:archimage at linux-magic.com] 
> Sent: Friday, September 21, 2001 6:35 AM
> To: sunhelp at sunhelp.org
> Subject: Re: [SunHELP] ping a port
> 
> I don't think ping can hit any port other than the standard 
> ICMP port that it queries.
> 
> Thomas
> ----- Original Message -----
> From: "David Baldwin" <dbaldwin at networkinsight.com>
> To: <sunhelp at sunhelp.org>
> Sent: Thursday, September 20, 2001 12:55 PM
> Subject: [SunHELP] ping a port
> 
> 
> > Hi all,
> > I am trying to find out how I can ping an ip through a 
> certain port on
> a
> > firewall.  As a test I tried to telnet to the port on the 
> system with 
> > "telnet x.x.x.x port#" and it failed.  But if I try "ping x.x.x.x
> port#"
> > it goes through.  ICMP is allowed on its default port but how can I 
> > change the port it tries?
> >
> > This is for standard "service alive?" checking.
> >
> > Thanks for any suggestions.
> >
> > Dave Baldwin
> > _______________________________________________
> > SunHELP maillist  -  SunHELP at sunhelp.org 
> > http://www.sunhelp.org/mailman/listinfo/sunhelp
> >
> 
> _______________________________________________
> SunHELP maillist  -  SunHELP at sunhelp.org 
> http://www.sunhelp.org/mailman/listinfo/sunhel> p
> 
> _______________________________________________
> SunHELP 
> maillist  -  SunHELP at sunhelp.org 
> http://www.sunhelp.org/mailman/listinfo/sunhel> p
> 

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5.5.2654.45">
<TITLE>RE: [SunHELP] ping a port</TITLE>
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As long as the service you want to check handles TCP =
connections, TELNET should be all you need. I regularly TELNET to my =
web and mail ports when I need to check that they are alive. Pick your =
favorite web site, telnet to port 80 and type something like "GET =
stuff.html" and you'll get a nice 404 HTML page back. Obviously if =
the firewall blocks access to that port, you're not going to get =
through, but neither will anyone else including actual client =
programs.

<P><FONT SIZE=3D2>--Adam</FONT>
</P>

> -----Original Message-----
 > From: David Baldwin [<A =
HREF=3D"mailto:dbaldwin at networkinsight.com">mailto:dbaldwin at networkinsig=
ht.com</A>] 
 > Sent: Friday, September 21, 2001 10:00 =
AM
 > To: sunhelp at sunhelp.org
 > Subject: RE: [SunHELP] ping a port
 > 
 > 
 > What I need to be able to do is check if a =
service's port is 
 > responding such as 80 or 443.  And, I need =
to be able to do 
 > it through a firewall. I have seen that ping is =
not the tool 
 > for that and port scanners might do the =
trick.  My next 
 > question is this, if I run a port scan is it =
going to let me 
 > know if the firewall is open or can it tell me =
if a port on 
 > the server on the other side is open and =
responding as well?  
 > Also, does Solaris come with any such =
tool?  I have heard of 
 > tools like nmap and netcat and they are =
available from sunfreeware.
 > 
 > Thanks, once again, for any suggestions.
 > Dave Baldwin
 > 
 > -----Original Message-----
 > From: Thomas Cameron [<A =
HREF=3D"mailto:archimage at linux-magic.com">mailto:archimage at linux-magic.c=
om</A>] 
 > Sent: Friday, September 21, 2001 6:35 AM
 > To: sunhelp at sunhelp.org
 > Subject: Re: [SunHELP] ping a port
 > 
 > I don't think ping can hit any port other than =
the standard 
 > ICMP port that it queries.
 > 
 > Thomas
 > ----- Original Message -----
 > From: "David Baldwin" =
<dbaldwin at networkinsight.com>
 > To: <sunhelp at sunhelp.org>
 > Sent: Thursday, September 20, 2001 12:55 =
PM
 > Subject: [SunHELP] ping a port
 > 
 > 
 > > Hi all,
 > > I am trying to find out how I can ping an =
ip through a 
 > certain port on
 > a
 > > firewall.  As a test I tried to =
telnet to the port on the 
 > system with 
 > > "telnet x.x.x.x port#" and it =
failed.  But if I try "ping x.x.x.x
 > port#"
 > > it goes through.  ICMP is allowed on =
its default port but how can I 
 > > change the port it tries?
 > >
 > > This is for standard "service =
alive?" checking.
 > >
 > > Thanks for any suggestions.
 > >
 > > Dave Baldwin
 > > =
_______________________________________________
 > > SunHELP maillist  -  =
SunHELP at sunhelp.org 
 > > <A =
HREF=3D"http://www.sunhelp.org/mailman/listinfo/sunhelp" =
TARGET=3D"_blank">http://www.sunhelp.org/mailman/listinfo/sunhelp</A></F=
ONT>
 > >
 > 
 > =
_______________________________________________
 > SunHELP maillist  -  =
SunHELP at sunhelp.org 
 > <A =
HREF=3D"http://www.sunhelp.org/mailman/listinfo/sunhel" =
TARGET=3D"_blank">http://www.sunhelp.org/mailman/listinfo/sunhel</A>>=
 p
 > 
 > =
_______________________________________________
 > SunHELP 
 > maillist  -  SunHELP at sunhelp.org =

 > <A =
HREF=3D"http://www.sunhelp.org/mailman/listinfo/sunhel" =
TARGET=3D"_blank">http://www.sunhelp.org/mailman/listinfo/sunhel</A>>=
 p
 >

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