[stunnel-users] stunnel client connecting to host with dynamic

Tue Feb 10 16:08:36 CET 2009

Hi, I have named local resolver enabled on the stunnel client (FreeBSD 
7.0). I did a test on the client and found there was no problem with the 
local resolver.

1. on the stunnel client: dig hostname.dynaip.org --> points to the 
correct IP of the stunnel host
2. restart ppp on stunnel host to get a new IP
3. on the stunnel client: dig hostname.dynaip.org --> points to the 
updated IP of the stunnel host

I tested ftp service on the stunnel host without going through stunnel, 
and it worked before and after the IP change.

Regards,
Adamson H

-------- Original Message --------
Subject: Re: [stunnel-users] stunnel client connecting to host with dynamic
From: Michal Trojnara <Michal.Trojnara at mobi-com.net>
To: stunnel-users at mirt.net
Date: 02/10/2009 10:32 PM
> Adamson H wrote:
>   
>> I added delay = yes to my stunnel client conf file and removed the cron 
>> script.  The rsync job (873) failed after the IP of the stunnel host had 
>> changed.  I had to manually restart stunnel to get the job done and put 
>> the cron script back again.
>>
>> delay = yes does not with work with ddns.
>>     
>
> That's really strange.  The relevant client.c code is:
>
>     /* setup address_list */
>     if(c->opt->option.delayed_lookup) {
>         resolved_list.num=0;
>         if(!name2addrlist(&resolved_list,
>                 c->opt->remote_address, DEFAULT_LOOPBACK)){
>             s_log(LOG_ERR, "No host resolved");
>             longjmp(c->err, 1);
>         }
>         address_list=&resolved_list;
>     } else /* use pre-resolved addresses */
>         address_list=&c->opt->remote_addr;
>
> Maybe you use some kind of advanced/broken resolver library that caches IP
> addresses?
>
> Best regards,
>     Mike
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>   