I don't have any 2511s in my network right now, but (unless I'm mistaken) ssh isn't an option for remote access to those routers.
i assure you that you are, in this case, mistaken. see appended. when composing my original post, i did not even consider that one would use anything but ssh to access a router over the net. randy --- Cisco Internetwork Operating System Software IOS (tm) 2500 Software (C2500-K4P-L), Version 12.0(21)S1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1) TAC Support: http://www.cisco.com/tac Copyright (c) 1986-2002 by cisco Systems, Inc. Compiled Tue 19-Feb-02 14:48 by nmasa Image text-base: 0x0303C018, data-base: 0x00001000 ROM: System Bootstrap, Version 5.2(8a), RELEASE SOFTWARE BOOTLDR: 3000 Bootstrap Software (IGS-RXBOOT), Version 10.2(8a), RELEASE SOFTWARE (fc1) oob0 uptime is 7 weeks, 2 days, 6 hours, 37 minutes System returned to ROM by power-on System restarted at 21:58:28 UTC Sat Jun 5 2004 System image file is "flash:/c2500-k4p-l.120-21.S1" cisco 2511 (68030) processor (revision D) with 16384K/2048K bytes of memory. Processor board ID 02313690, with hardware revision 00000000 X.25 software, Version 3.0.0. 1 Ethernet/IEEE 802.3 interface(s) 2 Serial network interface(s) 16 terminal line(s) 32K bytes of non-volatile configuration memory. 8192K bytes of processor board System flash (Read ONLY) Configuration register is 0x2102