Hi, I'm using app_pppd with a Digium-PRI-card for PPP connections. I had some strange problems with some IP packets passing and some not, e.g. ftp login went well, but as soon as I tried to up- or download a file, noting was transferred.
I finally guessed, it must have to do something with the packet size. Then I started pppd with the parameters mtu 296 and mru 296 as in further times with the analogue modems. Then, everything went fine (for a while). Unfortunately, PPP via ISDN is typically using a MTU and a MRU of 1500, and I found, that some commercial ISDN routers do not allow negotiating MTU and MRU. They insist to use a size of 1500. Since, using CAPI or ISDN4Linux (not via asterisk), pppd is working well with the MTU/MRU value of 1500, I assume, there is some packet size limitation in the asterisk part (including app_pppd). I tried to find any too small buffer or similar, but successless. May I ask you, where do you think, the limitation does come from: - from app_pppd (I don't think so) - from libpri - from chan_dahdi - from the dahdi kernel modules - from the asterisk kernel Any hint is welcome! Regards, Roger. _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
