Two ADSL lines , NAT , DHCP

[mfaridi]

I want run NAT and I have two ADSL lines from different providers , my system must has three Lan card , two Lan card for ADSL and one Lan card for users. I want my system get internet from TWO ADSL modem and NAT it to Users, we have 45 Users in our company.
I want my system give each user IP by DHCP and give them internet .
Can I conf my system use one ADSL line for browse and other ADSL line for Download ?

[jggimi]

As both Internet connections have similar bandwidth, consider using equal-cost multipath routing. The kernel will load-balance between the two routes. OpenBSD FAQ 6.14 explains how to provision this.

Can I conf my system use one ADSL line for browse and other ADSL line for Download ?

Q. What is the difference between an HTTP request for a small amount of data and an HTTP request for a large amount of data?

A. The amount of data received.

Q. Can I switch routes depending on the amount of data being received?

A. Not unless you know in advance that the amount of data to be sent is large. How would you?

Q. Ah, you are right. I wouldn't know. What about load balancing tools that examine HTTP requests?

A. There is relayd(8). But while it can inspect and filter HTTP requests, its load-balancing is designed to sit in front of web servers, not web clients. And it, too, will not have advance knowledge of the size of data to be received.

Q. So it is unlikely to be a solution for this?

A. Correct. It is unlikely to be useful.

[mfaridi]

Originally Posted by jggimi

As both Internet connections have similar bandwidth, consider using equal-cost multipath routing. The kernel will load-balance between the two routes. OpenBSD FAQ 6.14 explains how to provision this.Q. What is the difference between an HTTP request for a small amount of data and an HTTP request for a large amount of data?

A. The amount of data received.

Q. Can I switch routes depending on the amount of data being received?

A. Not unless you know in advance that the amount of data to be sent is large. How would you?

Q. Ah, you are right. I wouldn't know. What about load balancing tools that examine HTTP requests?

A. There is relayd(8). But while it can inspect and filter HTTP requests, its load-balancing is designed to sit in front of web servers, not web clients. And it, too, will not have advance knowledge of the size of data to be received.

Q. So it is unlikely to be a solution for this?

A. Correct. It is unlikely to be useful.

Thanks.
I need conf for pf .PF get internet from two ADSL modem and NAT it for 45 users.

[jggimi]

Something similar to this rule fragment may work.

ISP1 = "<NIC for ISP 1>"
ISP2 = "<NIC for ISP 2>"
LAN  = "<NIC for the local area network>"

match out on $ISP1 from $LAN:network to any nat-to ($ISP1)
match out on $ISP2 from $LAN:network to any nat-to ($ISP2)

Rules like these are shown in the Network Address Translation chapter of the PF Users Guide. More information can also be found in the pf.conf(5) man page.