Re: [Lksctp-developers] Sctp_bindx () doesn't send ASCONF

[Vlad Y. <vla...@hp...>]

cel...@or... wrote:
> My kernel version is: 2.6.21-1.3194.fc7 
> 
> And here is the output of sysctl -a | grep sctp
> 
> net.sctp.rto_initial = 3000
> net.sctp.rto_min = 1000
> net.sctp.rto_max = 60000
> net.sctp.valid_cookie_life = 60000
> net.sctp.max_burst = 4
> net.sctp.association_max_retrans = 10
> net.sctp.sndbuf_policy = 0
> net.sctp.rcvbuf_policy = 0
> net.sctp.path_max_retrans = 5
> net.sctp.max_init_retransmits = 8
> net.sctp.hb_interval = 30000
> net.sctp.cookie_preserve_enable = 1
> net.sctp.rto_alpha_exp_divisor = 3
> net.sctp.rto_beta_exp_divisor = 2
> net.sctp.addip_enable = 1
> net.sctp.prsctp_enable = 1
> net.sctp.sack_timeout = 200

Do both client and server systems have add-ip enabled?  If the
association is established, you should see an ASCONF chunk.

I just ran a small test over loopback on 2.6.22 kernel and it worked
fine.

-vlad

> 
> Céline
> 
> -----Message d'origine-----
> De : Vlad Yasevich [mailto:vla...@hp...] 
> Envoyé : mardi 29 juillet 2008 14:44
> À : zze-NGUYEN Celine RD-RESA-ISS
> Cc : lks...@li...
> Objet : Re: [Lksctp-developers] Sctp_bindx () doesn't send ASCONF
> 
> cel...@or... wrote:
>> Thank you Vlad for your answer.
>>
>> I found my previous error, I used bindx_test and sctp_xconnect in a wrong way. In bindx_test, a socket is created, then multiple addresses can be bound. I expected to bind my new configured IP address to an existing socket with this program, but it couldn't work since bindx_test operates with its own socket.
>>
>> Now I'm implementing handover support directly in the gftp (FTP client application) sources and I'm facing the same issue: the use of sctp_bindx doesn't cause ASCONF sending.
>>
>> Here are the differents steps of my code:
>>
>> ----------------------
>> Connection to the FTP server
>> ----------------------
>> -create an SCTP socket(with the function socket()) -bind to the local 
>> address, with a dynamic port(with the function bind()) -connect to the 
>> remote socket(with the function connect())
>>
>> ----------------------
>> Detection of the handover
>> ----------------------
>> -detect a new IP address(with a netlink socket)
>>
>> ----------------------
>> Dynamic address reconfiguration
>> ----------------------
>> -build a socket address with the new IP address and the port used for 
>> the previous bind -bind the new IP address to the existing socket 
>> (with the function sctp_bindx())
>>
>> The result of the function sctp_bindx() is a success but I can't see any ASCONF in my traces.
>>
>> Would you have any idea to explain this?
> 
> Which kernel version are you using?
> 
> Can you provide output of 'sysctl -a | grep sctp'.
> 
> Thanks
> -vlad
> 
>> Thanks
>>
>> Céline
>>
>