Cisco question...

What the hell is a !Q in a traceroute?

nyc6#trace www.demon.net

Type escape sequence to abort.
Tracing the route to www.demon.net (193.195.0.1)

  1 nac-wisper-10Mb.nac.net (207.99.122.4) 0 msec 0 msec 4 msec
  2 nac-wisper-10Mb.nac.net (207.99.122.4) !Q *
    lth1-e1.uk-core.uk.wisper.net (193.164.160.10) [AS 6765] 92 msec
  3 linx-1.router.demon.net (194.68.130.13) [AS 5459] 112 msec 108 msec 112 msec
  4 telehouse-1.router.demon.net (194.159.252.51) [AS 2529] 112 msec 112 msec 104 msec
  5 demon.www.demon.net (194.159.255.45) [AS 2529] 112 msec * 116 msec

What the hell is a !Q in a traceroute?

I seem to recall hearing (back in the mists of time) that it was a source
quench coming back, but don't take that as gospel...

According to:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios113ed/113ed_cr/f
un_r/frprt4/frtroubl.htm#16073

IP Trace Test Characters:

Char Description
-------- ------------------
* The probe timed out.
? Unknown packet type.
A Administratively unreachable. Usually, this output indicates that an
         access list is blocking traffic.
H Host unreachable.
N Network unreachable.
P Protocol unreachable.
Q Source quench.
U Port unreachable.

Similarly, for PING:

Char Meaning
----- -----------------
! Each exclamation point indicates receipt of a reply.
. Each period indicates the network server timed out while waiting for
a reply.
U A destination unreachable error PDU was received.
C A congestion experienced packet was received.
I User interrupted test.
? Unknown packet type.
& Packet lifetime exceeded.

Regards,

Randy Benn
http://www.clark.net/pub/rbenn/cisco.html

What the hell is a !Q in a traceroute?

nyc6#trace www.demon.net

Type escape sequence to abort.
Tracing the route to www.demon.net (193.195.0.1)

1 nac-wisper-10Mb.nac.net (207.99.122.4) 0 msec 0 msec 4 msec
2 nac-wisper-10Mb.nac.net (207.99.122.4) !Q *
   lth1-e1.uk-core.uk.wisper.net (193.164.160.10) [AS 6765] 92 msec
3 linx-1.router.demon.net (194.68.130.13) [AS 5459] 112 msec 108 msec

112 msec

4 telehouse-1.router.demon.net (194.159.252.51) [AS 2529] 112 msec 112

msec 104 msec

Paul Thornton wrote: