I have a lan where my main connection is 10.10.10.0/23 with default gateway 10.10.10.1.
There is and an adsl with lan 172.16.100.0/24
To take advantage of it I set up a linux Ubuntu server 16.04 with a network card eth0 = 172.16.100.250/24 gw 172.16.100.1
I then set up a proxy and defined a 2nd ip to some clients(no dhcp server in the network) and I setup proxy server on them.
I put a second network card on linux and set ip eth1=10.10.10.250/23
I did this because I want to use proxy server and for the network 10.10.10.0 i want also traffic coming from this network to go from the gateway 10.10.10.1
I do not know what to do ... can you help me?

Thank you in advance

so far no luck...

i made the following changes in squid.conf in order το be able to use squid and for 10.10.10.0 network
acl lan172 src 172.16.100.0/24
acl lan10 src 10.10.10.0/23

http_access allow lan172
http_access allow lan10

http_port 172.16.100.250:8080 name=8080
http_port 10.10.10.250:8090 name=8090

acl net172 myportname 8080 src 172.16.100.0/24
acl net10 myportname 8090 src 10.10.10.0/23

http_access allow net172
tcp_outgoing_address 172.16.100.250 net172
http_access allow net10
tcp_outgoing_address 10.10.10.250 net10

so now i can setup a client with proxy 172.16.100.250 port 8080 or with proxy 10.10.10.250 8090

the problem is that all the traffic is routed through 172.16.100.1

my routing table is

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 172.16.100.1 0.0.0.0 UG 0 0 0 eth0
10.10.10.0 10.10.10.1 255.255.254.0 UG 0 0 0 eth1
10.10.10.0 0.0.0.0 255.255.254.0 U 0 0 0 eth1
172.16.100.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0

How traffic coming from computers using 172.16.100.250 as proxy go through 172.16.100.1 and the computers using 10.10.10.250 go through 10.10.10.1?

Thanks in advance

No idea what to do next...for what I should be looking for???

As it seems this is a very weird scenario to implement and no one knows what to do.