OT: Keystrokes stick every ~1500 strokes

[Joe R. Jah]

On Fri, 26 Mar 2010, Chuck Swiger wrote:

> Date: Fri, 26 Mar 2010 17:31:38 -0700
> From: Chuck Swiger <cswiger at mac.com>
> To: Joe R. Jah <jjah at cloud.ccsf.cc.ca.us>
> Cc: freebsd-questions at freebsd.org
> Subject: Re: OT: Keystrokes stick every ~1500 strokes
>
> On Mar 26, 2010, at 5:18 PM, Joe R. Jah wrote:
> > Since last Monday my ssh connections started working erraticly.  Today I
> > tested it by holding down a key until it stops printing, and made several
> > itterations; it turns out that ~1500 key strokes print on the screen; then
> > it stops responding for several seconds; then it spits out ~25 missed
> > keystrokes.
>
> Sounds like a path MTU problem; perhaps something thinks it should be doing Jumbo frames and can't, or perhaps VLAN tagging or something else is being used....
>
> ping -s 1480 hostname and similar can be helpful.

Thank you Chuck for the suggetion; here's the ping response from three
different servers:

HP Unix server
# ping ip 1480 -n 3
PING ip: 1480 byte packets
1480 bytes from ip: icmp_seq=0. time=0. ms
1480 bytes from ip: icmp_seq=1. time=0. ms
1480 bytes from ip: icmp_seq=2. time=0. ms

----ip PING Statistics----
3 packets transmitted, 3 packets received, 0% packet loss
round-trip (ms)  min/avg/max = 0/0/0

Solaris server:
# ping -s ip 1480 3
PING ip: 1480 data bytes
1488 bytes from ip: icmp_seq=0. time=1. ms
1488 bytes from ip: icmp_seq=1. time=0. ms
1488 bytes from ip: icmp_seq=2. time=0. ms

----ip PING Statistics----
3 packets transmitted, 3 packets received, 0% packet loss
round-trip (ms)  min/avg/max = 0/0/1

FreeBSD server:
# ping -s 1480 ip
ping: packet size too large: 1480 > 56: Operation not permitted

Any ideas?

Regards,

Joe
-- 
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