Different bridging machine (new architecture, new router
(Cisco 677 SOHO), new ISP, new country ...) is working
well now, with no ssh2-detected corruption across the
bridge, which doesn't totally surprise me.

A dmesg is below, for the curious.

I have also scored a small Cisco 1400 router that I'll try
in place of the Efficient Networks box back home, which
will hopefully help isolate the router as a source of corruption.

     Sean.

NetBSD 1.5ZC (GENERIC) #1: Mon May  6 15:52:27 PDT 2002
    motor@alpha:/src/src/sys/arch/alpha/compile/GENERIC
AlphaStation 200 4/233, 233MHz, s/n 
8192 byte page size, 1 processor.
total memory = 144 MB
(2000 KB reserved for PROM, 142 MB used by NetBSD)
avail memory = 125 MB
using 921 buffers containing 7368 KB of memory
mainbus0 (root)
cpu0 at mainbus0: ID 0 (primary), 21064A-0
cpu0: Architecture extensions: 6<CIX,FIX>
apecs0 at mainbus0: DECchip 21071 Core Logic chipset
apecs0: DC21071-CA pass 2, 64-bit memory bus
apecs0: DC21071-DA pass 2
pci0 at apecs0 bus 0
pci0: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
siop0 at pci0 dev 6 function 0: Symbios Logic 53c810 (fast scsi)
siop0: interrupting at isa irq 11
scsibus0 at siop0: 8 targets, 8 luns per target
sio0 at pci0 dev 7 function 0: Intel 82378ZB System I/O (SIO) (rev. 0x84)
tlp0 at pci0 dev 11 function 0: DECchip 21040 Ethernet, pass 2.4
tlp0: interrupting at isa irq 5
tlp0: Ethernet address 00:00:f8:21:68:c6
tlp0: 10baseT, 10baseT-FDX, 10base5, manual
vga0 at pci0 dev 13 function 0: S3 ViRGE/DX (rev. 0x01)
wsdisplay0 at vga0 (kbdmux ignored): console (80x25, vt100 emulation)
isa0 at sio0
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
pckbc0 at isa0 port 0x60-0x64
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0 (mux ignored): console keyboard, using wsdisplay0
lpt0 at isa0 port 0x3bc-0x3bf irq 7
pcppi0 at isa0 port 0x61
midi0 at pcppi0: PC speaker
spkr0 at pcppi0
isabeep0 at pcppi0
isapnp0 at isa0 port 0x279: ISA Plug 'n Play device support
fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB, 80 cyl, 2 head, 18 sec
mcclock0 at isa0 port 0x70-0x71: mc146818 or compatible
isapnp0: read port 0x203
ne0 at isapnp0 port 0x220/32 irq 10
ne0: NE2000 (RTL8019) Ethernet
ne0: Ethernet address 00:20:18:61:88:64
ne0: 10base2, 10baseT, 10baseT-FDX, auto, default [0x00 0xb0] auto
scsibus0: waiting 2 seconds for devices to settle...
sd0 at scsibus0 target 0 lun 0: <IBM, DGHS09U, 0350> SCSI3 0/direct fixed
sd0: 8748 MB, 8152 cyl, 10 head, 219 sec, 512 bytes/sect x 17916240 sectors
sd0: sync (100.0ns offset 8), 8-bit (10.000MB/s) transfers, tagged queueing
cd0 at scsibus0 target 3 lun 0: <TOSHIBA, CD-ROM XM-5401TA, 3605> SCSI2 5/cdrom 
removable
cd0: async, 8-bit transfers
Kernelized RAIDframe activated
root on sd0a dumps on sd0b
root file system type: ffs