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[ale] PPP/SSH VPN dies randomly



Okay, lemme rephrase:  I'd _like_ to have 99.99999% availability.  I feel
that I can offer at least that between 8am-7pm EST though.  I have a T1 VPN
with a redundant DSL fallover VPN.  So basically, I have 2 pipes between my
locations.  Should I cron the VPN so that it starts every morning at like
7:30 AM?  Should I kill it just before then, or at COB?  I'd like to have
the VPN as much as possible during "human" hours in case someone works late
or gets in early.

Our KEY business hours are between 8AM EST and 6PM Central time (roughly
8am-8pm EST).

Any suggestions?
-CB


> -----Original Message-----
> From: James P. Kinney III [mailto:jkinney at localnetsolutions.com]
> Sent: Monday, March 04, 2002 9:56 PM
> To: Christopher Bergeron
> Cc: Ale
> Subject: RE: [ale] PPP/SSH VPN dies randomly
>
>
> If you're expected to provide 7 nines of VPN reliability, I'm glad I
> don't work for your company!
>
> The only way to get even 99.99% VPM uptime would involve multiple,
> redundant, synchronous data lines. I don't want to even think about the
> engineering costs.
>
> As most places that have VPN's have them automated for connection setup,
> use that to your advantage. Keep a connection test running at intervals
> appropriate to your normal loading. When the connection test fails,
> reroute the VPN traffic before the tunneling to a buffered fifo and
> remake the connection. Dump the buffer through the connection when it's
> ready.
>
> I have never kept a VPN up for days on end. There has always been some
> network glitch outside my control that has required a reconnect. I saw a
> statistic (I need to keep a better log of this stuff) that claimed there
> is a fiber line cut every day in the US.
>
> On Mon, 2002-03-04 at 21:43, Christopher Bergeron wrote:
> > And this is acceptable?  Forgive me for being naive, but that
> would be like
> > using an Operating System that crashed almost daily and wrote
> it off as, "I
> > guess that's just how it has to be".  By definition there has to be a
> > "reason" for it and therefore, a solution.
> >
> > Have you confronted your VPN vendor about it (please say it
> wasn't Cisco)?
> > If so, what was their response?
> >
> > I'm currently adding a VPN watchdog to my crontab, but even 1 minute of
> > downtime per month is a major malfunction.  Someone has to have
> some clues
> > about this.  I'm not using IPsec, I'm using SSH over PPP.  I
> understand that
> > encryption can be finicky, but I have a hard time blaming SSH.
> I'm expected
> > to produce 99.99999% availability and I can't accept anything
> less.  Call me
> > a spoiled Linux user for assuming availability, if you must...
> >
> > :)
> >
> > Anyone have any leads or even starting points for debugging this?
> >
> > Thanks,
> > CB
> >
> >
> > > -----Original Message-----
> > > From: Geoffrey [mailto:esoteric at 3times25.net]
> > > Sent: Monday, March 04, 2002 7:53 PM
> > > To: Christopher Bergeron
> > > Cc: Ale
> > > Subject: Re: [ale] PPP/SSH VPN dies randomly
> > >
> > >
> > > No real help, except to say that this happens to my (commercial) vpn
> > > connectivity on occasion.  It presents an error message
> something to the
> > > effect of: "heartbeat missed, assuming tunnel is down."  This is an
> > > ipsec vpn.
> > >
> > > Christopher Bergeron wrote:
> > > > Does anyone have any idea why my VPN connection dies
> > > periodically?  It seems
> > > > to be okay for a few days and then one of the procees goes
> > > defunct and the
> > > > connection goes down.  I'm tunneling ssh over ppp over a T1
> > > connection to
> > > > the 'net on both sides.
> > > >
> > > > Any clues are greatly appreciated...
> > > > -CB
> > > >
> > > >
> > > > ---
> > > > This message has been sent through the ALE general discussion list.
> > > > See http://www.ale.org/mailing-lists.shtml for more info.
> > > Problems should be
> > > > sent to listmaster at ale dot org.
> > > >
> > > >
> > > >
> > >
> > >
> > > --
> > > Until later: Geoffrey		esoteric at 3times25.net
> > >
> > > I didn't have to buy my radio from a specific company to listen
> > > to FM, why doesn't that apply to the Internet (anymore...)?
> > >
> > >
> > > ---
> > > This message has been sent through the ALE general discussion list.
> > > See http://www.ale.org/mailing-lists.shtml for more info.
> > > Problems should be
> > > sent to listmaster at ale dot org.
> > >
> >
> >
> > ---
> > This message has been sent through the ALE general discussion list.
> > See http://www.ale.org/mailing-lists.shtml for more info.
> Problems should be
> > sent to listmaster at ale dot org.
> >
> --
> James P. Kinney III   \Changing the mobile computing world/
> President and COO      \          one Linux user         /
> Local Net Solutions,LLC \           at a time.          /
> 770-493-8244             \.___________________________./
>
> GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
> <jkinney at localnetsolutions.com>
> Fingerprint = 3C9E 6366 54FC A3FE BA4D 0659 6190 ADC3 829C 6CA7
>
>
>


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