Re: [Sshkeychain-developers] Overhaul

[Crimson S. <cri...@gm...>]

On Nov 11, 2009, at 10:51 , Tim Cutts wrote:
> On 10 Nov 2009, at 1:31 pm, Crimson Scythe wrote:
>> Personally, I only use the tunneling features.
>>
>> My home computer sadly sits behind an ISP-level NAT, which means I
>> can't open any ports at all. To get around this, I use SSHKeychain to
>> automatically launch tunnels with both forward and  reverse port
>> forwarding. The only major issue I've experienced in my use is if
>> there's a network hick-up, or if my work computer goes down/reboots,
>> causing the tunnels to go down. I'd _love_ to have SSHKeychain
>> automatically detect stale/broken tunnels and relaunching them. In
>> other words, some sort of persistent tunneling feature. Is this  
>> doable?
>
> Difficult to do in a reliable way, I'd have thought.  How do you  
> tell the difference between a permanent failure (where you shouldn't  
> attempt to restart the tunnel) and a transient one, such as a  
> temporary network glitch while OSPF finds a new route through the  
> network?  What time thresholds should you use before attempting to  
> restart the tunnel?

Well, I guess setting a user-defineable time threshold could work?  
Let's say 5 minutes or so. If the tunnel is down for that long, can it  
even resume? As it is now, if the network has a glitch, I simply lose  
all contact with the computer until the tunnel is manually  
reestablished.

--Thomas