net access failover

2003-12-27 Thread mark abrams
Hello,

I have a cable modem and and a dsl connction to my machine. I would like to 
use the cable modem as my default connection and automatically fail-over to 
the dsl connection if/when the cable modem goes down.

Can routed(8) do this ? If so how? And is there a better way ?

Any hints appreciated.

Thanks,

MArk

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Re: net access failover

2003-12-27 Thread Barney Wolff
On Sat, Dec 27, 2003 at 03:57:16PM -0500, mark abrams wrote:
> 
> I have a cable modem and and a dsl connction to my machine. I would like to 
> use the cable modem as my default connection and automatically fail-over to 
> the dsl connection if/when the cable modem goes down.
> 
> Can routed(8) do this ? If so how? And is there a better way ?

I guess this should be a FAQ.  For something that can be adapted to
do what you want, see http://www.databus.com/dslsec.tgz .

routed won't do it because (unlike real multihoming) your address on
the two networks is different and the ISPs are not sending you any
routing protocol packets.  A simpleminded ping of the cable ISP's
router, and changing the default route when it goes away and comes back,
should work fine.  NATing adds a little to the effort, if you do it.
Existing connections will not survive a transition, but that's usually
not a big deal.

-- 
Barney Wolff http://www.databus.com/bwresume.pdf
I'm available by contract or FT, in the NYC metro area or via the 'Net.
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Re: Finding RTT's and RTO's

2003-12-27 Thread Petri Helenius
Tanmay Ganacharya wrote:

Hello,
I am currently using FreeBSD 4.8. I am want to record RTT and RTO 
values of a tcp connection.
Could anyone please tell me which variables in which files hold the 
current RTT and RTO values.
Once known I can put printfs and print these values.
This seems to come up often enough in the *BSD land and in the 
Linux-land so anyone
up for specifying an ioctl to retrieve the tcpcb to userland ?

Pete

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Recording RTT and RTO values

2003-12-27 Thread Tanmay Ganacharya
Hello,
I am currently using FreeBSD 4.8. I am want to record RTT and RTO values of
a tcp connection.
Could anyone please tell me which variables in which files hold the current
RTT and RTO values.
Once known I can put printfs and print these values.
Also if there is any other easier way of finding these values please do let 
me know.
Thanks in advance,
Regards,
Tanmay Ganacharya

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Recording RTT and RTO values

2003-12-27 Thread Tanmay Ganacharya
Hello,
I am currently using FreeBSD 4.8. I am want to record RTT and RTO values of
a tcp connection.
Could anyone please tell me which variables in which files hold the current
RTT and RTO values.
Once known I can put printfs and print these values.
Also if there is any other easier way of finding these values please do let 
me know.
Thanks in advance,
Regards,
Tanmay Ganacharya

_
Cricket crazy? Catch the latest action. http://server1.msn.co.in/sp03/gprs/ 
Now on your mobile!

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