Dear Sir/Madam;
Hello,
I have a Cisco Router 2620 with two modules of WAN Cards ("WIC-1T" and
"WIC-2T".
I also have 2 internet leased lines with different IP classes
(128Kbps) on these modules.
Please tell me: How can I balance our traffic on these both internet
leased line?
Please tell me the "Cisco Commands" for Balancing or sharing two
leased line on a router with two WAN Cards at the same time?
Best Regards
Ahmad Reza Yousefi

Note: I need all of my IPs and I can't renunciation from any IP range.

I recently purchased a Nexland router to accomplish this task.  If you
don't get an answer, the Nexland balances the load. 
(www.nexland.com).  If you are using multiple computers it really does
a great job of allocating bandwidth.  If it's a single computer
surfing you will probbaly only use one line most of the time except
for downloads if you use a product like Download Accelerator (found on
download.com).

Also, if you bought the router and have support. Cisco IMHO has the
best phone support in the technical community.  They'll work with you
to resolve just about anything.

I don't know how second hand support works, but worth looking into.

Are your two WAN connections from two different service providers?  Or
are they both from the same provider?  Do you have IP space assigned
by more than 1 provider?  What is the size of the IP space allocation?

Basically the only way to load balance traffic on the Internet, is
going to be thru BGP (Border Gateway Protocol).  Get back with me on
the above questions and I will let you know if you will be able to do
this.

Dear Sir/Madam;
Hello,

1- I'm using two WAN connections from two different service providers.
2- Yes, I have IP space assigned from two different service providers.
3- From first leased line I have "32 IP of Class C" and from another
one I have "One Class C IP".
Now I'm waiting of your answer.

Sincerely,
Ahmad Reza Yousefi

If you have hosts like web servers, mail gateways etc., products on
www.nextland.com site cannot solve your problem.

Proposal 1: Think about use just one ISP.

Proposal 2: Obtain an Autonomous System (AS) Number, obtain minimum
class C IP block, and assign that block to your AS number. Use BGP on
your router. If you want to get BGP table partially your router will
be enough but if you want to get whole BGP table of Internet you will
need more memory and processor power (maybe new 3700series Cisco with
256 MB Memory). After this, connections to ISPs are named as peering.
Make peering agreement with any ISPs that you want.

Proposal 3: Answer to exactly what you asked.
-Now you have two IP SET ( IPSET1 given by ISP-A and IPSET2 given by
ISP-B)
-ISP-A announces to whole Internet that he covers IPSET1, so on the
Internet all packets to IPSET1 will be forwarded to ISP-A. This means
ISP-B should add IPSET1 to their routing tables. But they do not
accept it and they suggest Proposal 2.
You cannot manage incoming traffic but you have some options for
outgoing traffic. Could you please check your interfaces like follows
when both IPSETs are heavily using.
 
show interfaces
.............
Serial0/0 is up, line protocol is up
..............
5 minute input rate xxxx
5 minute output rate xxxx
..............
Serial0/1 is up, line protocol is up
..............
5 minute input rate xxxx
5 minute output rate xxxx
..............
is any of these rates stay as zero?

Check your configuration, are there lines like follows?
ip policy route-map POLICYNAME
access-list ACCLSTNUMBER permit ip IPSET1 SUBNETMASK any
route-map POLICYNAME permit NUMBER
 match ip address ACCLSTNUMBER
 set ip next-hop IPADDRESSOFSERIALINT

Check how much line exist like follows?
ip route 0.0.0.0 0.0.0.0 Serial0/0

Please, be aware that information about your Internet router is so
sensitive. For your safety you should never publish your IP address or
any part of configuration to the public. If you want to answer my
questions please answers like follows.
-serial 0/0 output rate is always zero
-there are some access list lines. / there is not any ip policy line.
-There is only one ip route line

Regards,
Mustafa AKSU