Re: CVS blocked or delayed from some IP ranges?

[Steven Bellovin <smb%cs.columbia.edu@localhost>]

On Dec 22, 2010, at 10:30 23AM, Frank Wille wrote:

> On Wed, 22 Dec 2010 09:15:40 -0500
> Steven Bellovin <smb%cs.columbia.edu@localhost> wrote:
> 
>> When a connection attempt is failing, what does netstat show?  Does
>> it show the attempt in SYN_SENT state or ESTAB state?  The former is
>> consistent with port-blocking; the latter suggests some sort of
>> application-level timeout or PMTU problem.
> 
> Will check that next time. Thanks.
> 
> 
>>> frank@arwen tcptraceroute cvs.netbsd.org 22
>>> Sorry, media type of device pppoe0 (#51) is not supported
>>> 
>> Since you say it's a router, is there some machine connected to it
>> that you can use?
> 
> Sure. But I have to be back from the office first and switch it on. :)
> Seems that tcptraceroute works when using a LAN interface...

Yes -- it uses a raw interface and builds its own packet from the link-layer up.

                --Steve Bellovin, http://www.cs.columbia.edu/~smb