On Thu, 14 Feb 2013, Wojciech Puchar wrote: > i use rsh/rlogin regularly within LAN and over encrypted tunnels > it works generally fine but have strange behavior > > when i output long amount of text in console (eg. cat bigfile), where long > is like 20kB it > > a) display part of it and hangs (i have to kill rlogin) - rarely > b) display part of it and rest is skipped. then i can work normally. > > > ssh doesn't have such a problem. > > what is wrong? >
This sounds oddly like a bug we discovered back in the 4 days with rsh. We discovered a bug years ago when moving from FreeBSD-4.8 to 4.11 (with many back-ported drivers) that a combination of the em(4) driver (back-ported from RELENG_6) and changes to libc ended up in the traces. We could easily replicate the issue in csh with: repeat 100 rsh <host> date HINT: Set yourself up in /etc/hosts.equiv on <host> for password-less entry Repeat about 5 or 6 times and then eventually the connection will hang and you won't be able to make more connections for some time. Next step? Execute "netstat -an | less" and look for oddities (like a mass pile of FIN_WAIT_2 connections). In our case (ymmv) the final ACK was not being sent leaving the client side stacking up a bunch of connections that take msl.timeout time to expire (iirc). If I do remember correctly the problem happened when the server was using an em(4) driver. Our ultimate solution was to either switch critical servers to fxp(4) based hardware or roll entire sites over to using key-based SSH (which may work for you -- have you thought about giving ssh-keygen a try? that is, if you're using rsh for the convenience of password-less entry via hosts.equiv for example). -- Devin _____________ The information contained in this message is proprietary and/or confidential. If you are not the intended recipient, please: (i) delete the message and all copies; (ii) do not disclose, distribute or use the message in any manner; and (iii) notify the sender immediately. In addition, please be aware that any message addressed to our domain is subject to archiving and review by persons other than the intended recipient. Thank you. _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
