Re: [Lksctp-developers] RE: SCTP Event - SCTP_ADDR_UNREACHABLE

[Piero B. <bo...@cs...>]

Actually I've 1.0.1 version. I try SCTP_GET_PEER_ADDR_INFO and=20
SCTP_PEER_ADDR_CHANGE but they didn't seem to work..


Quoting Sridhar Samudrala <sr...@us...>:

> Piero,
>
> You should receive SCTP_PEER_ADDR_CHANGE notifications if they are enab=
led
> when there is any change in the status of the transport addresses.
> SCTP_GET_PEER_ADDR_INFO socket option also should work. Are you using a
> recent version of lksctp?
>
> -Sridhar
>
> On Tue, 8 Feb 2005, Piero Borello wrote:
>
> > I've had the same problem as yours.
> > when the primary interface becomes UNREACHABLE my client-server waits
> > about 1minute (too much for my real time voice application).
> > The only solution I found is to count the non-ACKed TSN and, if this =
value
> is
> > too
> > high,  I try another interface as soon as possible signaling error to
> > the upper layer. (see STRUCT sctp_status  -> sstat_unackdata in SCTP =
API
> draft).
> > Now I change the interface about 1 or 2 seconds after the primary pat=
h
> falls
> > down.Perhaps this is not the right way but it is the best one I found=
.
> > I don't know very well LKSCTP; I use PWLib with my SCTP patch for SCT=
P API
> > and I made this correction in my SCTP-write function.
> > If anybody is interested in this issue, maybe I could upload
> > some stuff as soon as I can.
> >
> > Regards
> > Piero
> >
> >
> >>
> >> Message: 1
> >> From: "Anatoly Khusid" <ana...@ul...>
> >> To: <lks...@li...>
> >> Cc: "'Sridhar Samudrala'" <sr...@us...>
> >> Subject: RE: [Lksctp-developers] SCTP Event - SCTP_ADDR_UNREACHABLE
> >> Date: Mon, 7 Feb 2005 10:38:42 -0500
> >>
> >> I am wondering how LKSCTP is implemented to discover that the curren=
t
> >> destination path is faulty and that it needs to attempt sending data=
 on
> the
> >> alternative path.
> >>
> >> I have a client and server talking to each other through two private=
 LANs.
> >> The client keeps sending data messages in a tight loop.  While clien=
t is
> >> sending data messages, I do 'ifconfig' on a primary interface (the o=
ne
> that
> >> is currently used to send data).  I'd expect sending to continue thr=
ough
> the
> >> alternative LAN without noticing any obvious delay.  Well, it takes =
1
> minute
> >> before sending of data starts going through the other interface.
> Meanwhile
> >> (during this one minute interval), sendmsg() on a client side pretty
> quickly
> >> gets blocked.  Then nothing happens for 1 minute, and then the data =
starts
> >> going to the other interface.
> >> I thought the best thing to try another interface as soon as SCTP de=
tects
> >> that it did not receive an ACK.  Does LKSCTP wait until MAX RTO befo=
re it
> >> tries to use another interface?  If thats the case, this needs to be
> >> optimized.
> >>
> >> Thanks,
> >>
> >> Anatoly
> >>
> >>
> >>
> >> -----Original Message-----
> >> From: lks...@li...
> >> [mailto:lks...@li...]On Behalf Of
> >> Anatoly Khusid
> >> Sent: Friday, February 04, 2005 12:02 PM
> >> To: lks...@li...
> >> Subject: [Lksctp-developers] SCTP Event - SCTP_ADDR_UNREACHABLE
> >>
> >>
> >> It takes a VERY long time before I get an event SCTP_ADDR_UNREACHABL=
E
> after
> >> I disconnect the remote IP address.
> >> I have two machines with two private lans.  I am sending traffic, an=
d when
> I
> >> disonect a cable on the remote side, the local side takes forever be=
fore
> >> sending SCTP_ADDR_UNREACHABLE event.
> >> I would think this should be a very quick?!  I am using the default
> >> provisioning values.
> >>
> >> Anyone has any idea whats going on?
> >>
> >> I am also using SuSe Linux 2.6.5-7.111.19-smp
> >>
> >>
> >>
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> >>
> >>
> >>
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> >>
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