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

[Michael Hirsch]

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
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