[lug] can ping the host, but can't ssh for a few seconds

[Stephen Queen]

Maybe try the -v option of ssh on the first iteration, see if it gives
you a hint why it is failing.
[software at saratoga build-jaws-svn]$ date; ping -c 1 warsaw;
/sbin/route; ssh -v software at warsaw

Steve

On 7/10/12, Michael Hirsch <mdhirsch at gmail.com> wrote:
> On Mon, Jul 9, 2012 at 1:29 PM, Ebben Aries <earies at dscp.org> wrote:
>
>> You are sending an echo req -> saratoga (localhost eth0 by the looks of
>> it), yet following that w/ a connection attempt to warsaw - have a look
>> at
>> your arp cache for warsaw's address if it is on the same segment or your
>> gw (192.168.1.1) if not.  Alter your ping statement to target warsaw
>> rather
>> to trigger an arp request prior to connection attempt. (which looks like
>> what you were attempting to do in the first place)
>>
>
> OMG, duh!  Don't know how I did that.  Obviously I should be pinging
> warsaw.  Thanks for pointing it out.
>
> Unfortunately, it still behaves like that.  Here is the output of pinging
> warsaw, then trying to ssh there.  Then I wait a short time and try again.
> The second time it connects.  The route hasn't changed.
>
> [software at saratoga build-jaws-svn]$ date; ping -c 1 warsaw; /sbin/route;
> ssh software at warsaw
> Tue Jul 10 09:15:12 MDT 2012
> PING warsaw.stirlingsystems.net (192.168.1.21) 56(84) bytes of data.
> 64 bytes from warsaw.stirlingsystems.net (192.168.1.21): icmp_seq=0 ttl=64
> time=4.54 ms
>
> --- warsaw.stirlingsystems.net ping statistics ---
> 1 packets transmitted, 1 received, 0% packet loss, time 0ms
> rtt min/avg/max/mdev = 4.546/4.546/4.546/0.000 ms, pipe 2
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use
> Iface
> 172.16.30.0     *               255.255.255.0   U     0      0        0
> vmnet8
> 192.168.137.0   *               255.255.255.0   U     0      0        0
> vmnet1
> 192.168.8.0     192.168.1.51    255.255.255.0   UG    0      0        0
> eth0
> 192.168.0.0     *               255.255.252.0   U     0      0        0
> eth0
> 169.254.0.0     *               255.255.0.0     U     0      0        0
> eth0
> default         192.168.1.1     0.0.0.0         UG    0      0        0
> eth0
> ssh: connect to host warsaw port 22: No route to host
> [software at saratoga build-jaws-svn]$ date; ping -c 1 warsaw; /sbin/route;
> ssh software at warsaw
> Tue Jul 10 09:15:17 MDT 2012
> PING warsaw.stirlingsystems.net (192.168.1.21) 56(84) bytes of data.
> 64 bytes from warsaw.stirlingsystems.net (192.168.1.21): icmp_seq=0 ttl=64
> time=0.196 ms
>
> --- warsaw.stirlingsystems.net ping statistics ---
> 1 packets transmitted, 1 received, 0% packet loss, time 0ms
> rtt min/avg/max/mdev = 0.196/0.196/0.196/0.000 ms, pipe 2
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use
> Iface
> 172.16.30.0     *               255.255.255.0   U     0      0        0
> vmnet8
> 192.168.137.0   *               255.255.255.0   U     0      0        0
> vmnet1
> 192.168.8.0     192.168.1.51    255.255.255.0   UG    0      0        0
> eth0
> 192.168.0.0     *               255.255.252.0   U     0      0        0
> eth0
> 169.254.0.0     *               255.255.0.0     U     0      0        0
> eth0
> default         192.168.1.1     0.0.0.0         UG    0      0        0
> eth0
> software at warsaw's password:
>
>
> Thanks,
>
> Michael
>