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-   -   OT: cannot ping remote machine (http://www.linux-archive.org/fedora-user/532149-ot-cannot-ping-remote-machine.html)

Timothy Murphy 05-29-2011 01:48 PM

OT: cannot ping remote machine
 
I can access a remote computer (in Italy) with openvpn,
but I cannot ping its external address,
or ssh to this address.

I can login with ssh to the openvpn address 192.168.5.22 ,
and then I get the external address with
------------------------
[tim@alfred ~]$ lynx -dump "http://checkip.dyndns.org"

Current IP Address: 79.46.130.4

[tim@alfred ~]$ ping -c1 79.46.130.4
PING 79.46.130.4 (79.46.130.4) 56(84) bytes of data.
64 bytes from 79.46.130.4: icmp_seq=1 ttl=253 time=1.14 ms
------------------------

As shown, I can ping this address from the remote machine.
However, I cannot ping it from my home machine (in Ireland).

I'm using a Billion modem/router in Italy;
I'm not sure if the problem lies with this?
Or if some server along the way refuses to allow pings?

When I run "traceroute 79.46.130.4" from Ireland
I get as far as Milan (in Italy) but then just get *** .

The issue is rather academic, as I can (and do) use openvpn.
But I have a (free) DynDNS account, which gets the IP address OK,
and I would quite like to be able to access the machine that way.

Any elucidation gratefully received,
and apologies if this is too OT.

--
Timothy Murphy
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

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Patrick O'Callaghan 05-29-2011 03:47 PM

OT: cannot ping remote machine
 
On Sun, 2011-05-29 at 14:48 +0100, Timothy Murphy wrote:
> I'm using a Billion modem/router in Italy;
> I'm not sure if the problem lies with this?
> Or if some server along the way refuses to allow pings?

Most likely the latter. Some ISPs don't respond to pings from their
internal networks, even though AFAIK this is frowned on by the RFCs.

There's a TCP-based version of traceroute out there
(http://michael.toren.net/code/tcptraceroute/) which might get you
farther. I don't know if there's repo for it anywhere.

poc

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Genes MailLists 05-29-2011 04:05 PM

OT: cannot ping remote machine
 
On 05/29/2011 09:48 AM, Timothy Murphy wrote:
>
> I can login with ssh to the openvpn address 192.168.5.22 ,
> and then I get the external address with

Bit confused - can you ssh to the remote IP from your home machine ?


On 05/29/2011 11:47 AM, Patrick O'Callaghan wrote:

> There's a TCP-based version of traceroute out there


The standard linux version will do just fine (see man page)

traceroute -T

will use tcp (-I uses icmp).

gene/



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Joe Zeff 05-29-2011 04:58 PM

OT: cannot ping remote machine
 
On 05/29/2011 06:48 AM, Timothy Murphy wrote:
> When I run "traceroute 79.46.130.4" from Ireland
> I get as far as Milan (in Italy) but then just get *** .

I've seen this before. It just means that the next machine on the path
is dropping pings on the floor instead of responding. As long as you
can reach the box with openvpn, it's not a problem. HAND.
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Patrick O'Callaghan 05-29-2011 08:02 PM

OT: cannot ping remote machine
 
On Sun, 2011-05-29 at 12:05 -0400, Genes MailLists wrote:
> On 05/29/2011 09:48 AM, Timothy Murphy wrote:
> >
> > I can login with ssh to the openvpn address 192.168.5.22 ,
> > and then I get the external address with
>
> Bit confused - can you ssh to the remote IP from your home machine ?
>
>
> On 05/29/2011 11:47 AM, Patrick O'Callaghan wrote:
>
> > There's a TCP-based version of traceroute out there
>
>
> The standard linux version will do just fine (see man page)
>
> traceroute -T
>
> will use tcp (-I uses icmp).

OK, I didn't know that.

poc

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Timothy Murphy 05-29-2011 10:09 PM

OT: cannot ping remote machine
 
Genes MailLists wrote:

>> I can login with ssh to the openvpn address 192.168.5.22 ,
>> and then I get the external address with
>
> Bit confused - can you ssh to the remote IP from your home machine ?

I think I said that I cannot ping or ssh into the remote IP,
but I can access it with openvpn.

> The standard linux version will do just fine (see man page)
>
> traceroute -T
>
> will use tcp (-I uses icmp).

I'm afraid this gets as far as the same site:

12 te0-4-2-0.milano50.mil.seabone.net (195.22.210.107) 91.815 ms
91.153 ms ibs-resid.milano50.mil.seabone.net (93.186.128.74) 96.074 ms

traceroute -I seems to get one stop further:

13 ibs-resid.milano50.mil.seabone.net (93.186.128.74) 74.827 ms
69.996 ms 72.448 ms

Thanks for all the suggestions.
I blame Berlusconi; he owns Milan ...


--
Timothy Murphy
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

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