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OK, I've read several HOW-TOS, read through message archives and I am still
lost. I am not even sure if IP Masquerading is the best solution to my
problem.
First my problem, I am trying to simulate several thousand hosts with just a
few hosts. The purpose is to test a server (not a Linux system) with a large
number of connections to individual hosts (as opposed to the same host) and
also a large routing table (each host will have its own host route, don't
ask it is the way it has to be).
I thought I could configure IP Masquerading so that it would translate the
destination addresses of my 3,000 hosts to a single or small number of hosts
to act as the other end of the connection. (Yes, I know I have sort of turn
around client and server here but once the connection is established it will
not matter for my testing).
I have a Linux system with 2 interfaces, 10.1.1.62 and 172.16.1.62. My
"server" is 172.16.1.203 with a route indicating that 172.16.1.62 is the
gateway for 10.1/16.
On the Linux system I did the following:
ipchains -A forward -d 10.1.0.0/16 -j MASQ -m 1
ipmasqadm mfw -A -m 1 -r 10.1.1.13 2323
resulting in:
# ipchains -L
Chain input (policy ACCEPT):
Chain forward (policy ACCEPT):
target prot opt source destination ports
MASQ all ------ anywhere 10.1.0.0/16 n/a
Chain output (policy ACCEPT):
# ipmasqadm mfw -L
fwmark rediraddr rport pcnt pref
1 10.1.1.13 2323 10 10
When, from my server, I connect to 10.1.1.13, Masking works. That is
10.1.113 sees a connection from 10.1.1.62 while 172.16.1.203 sees a
connection 10.1.1.13. However, 10.1.113 actually exists. If I try to connect
to 10.1.1.14, which does not exist, what I see is 10.1.162 ARPing 10.1.1.14
instead of going to 10.1.1.13.
I assume that I am misunderstanding what the -r means in the ipmasqadm
command.
Can IP Masquerading do this, if so how, if not is there something that can?
Oh yes, I am running Red Hat 6.2 with ipmasqadm 0.4.2-4
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