[LARTC] Several basic doubts

[Ricardo Chamorro]

I have a connection cablemodem (down 1024kbit up 256 kbit) that spreads Internet to a LAN of 4 PC.  Router-firewall is one 486 DX4 100 96 MB RAM that runs a Debian Sarge (kernel 2,4,25), that does NOT serve nor squid, nor samba, nor smtp, etc.... single do routing-firewalling.  
I am something confused by opinions and "presumed" manual and howto that I have read and have confused I more...  Then I ask to them you:  
I must do shaping with the NIC that connect with ISP (etho)...  or with the NIC of the LAN (eth1)????...  Because I have seen opinions on both possibilities, but I have tested the two and second did not give me good results.  In the case of using the NIC to Internet (eth0) I must set like CEIL the bandwidth of downstream (1024kbit) or upstream (256kbit)????...  And in such case I must set the 75 percent approximately of the bandwidth to avoid to saturate the band?  
Another question is if it agrees -upon my case- using priorities for the classes...
Thanks in advance
Ricardo
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