Networking :: Slow Outbound - Fast Outbound Cross Country Connection

Jun 2, 2011

I'm having an issue where a server in CA (1000/full) and in VA (100/full) have very lopsided data transfer.

CA -> VA with iperf shows ~20Mbps
VA -> CA with iperf shows ~93Mbps

If we change the CA server to 100/FULL, transfer speed is 93Mbps both ways.

Some tuning was done to TCP window scaling parameters, but it won't correct the issue, just improve the CA -> VA numbers to what is listed above. I will say, turning TCP window scaling OFF will lower the transfer speed both ways to < 20Mbps.

The only clue I have when looking at wireshark dumps is that the window scale going OUT would never go past 10240 (scale is 8, so 2^8 x 40bytes). In the opposite direction, the window size will go above 3MB (scaled).

It is not a bandwidth problem as iperf with UDP shows 93Mbps both ways. Local transfers (CA 1000/full to CA 100/full) show full speed both ways, so I feel it is strictly related to TCP window scaling.

RedHat 5 64-bit on both sides. Any ideas why it won't scale above 10240?

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Code:

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Code:

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Dec 18, 2010

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Mar 15, 2010

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I am in the process of setting up a new SMTP outbound mail server. This is the current software & configuration (what is installed on this new machine):

All of the customer data (Names, E-Mail Addresses, etc that these e-mails are going to) are currently loaded in a Microsoft SQL Database.

My machine that I am using is plugged into the DMZ. I have 1 ip address for the 1 network card. I have also added/bound 4 more ip addresses to that network card.

I have configured Postfix for Multiple IP Addresses.

I can, from the command line, send successful test e-mails and receive them in my personal account.

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Ensure that I have my Network / Interfaces file and my Postfix's Master.cf/Main.cf files setup correctly?

How can I setup this server to be an Outbound SMTP server and get it to use all 5 of the IP Addresses to send these e-mails quickly?

What can I use to check and ensure that this server is in fact sending out emails on all 5 IP

Addresses (I heard that there is a program named "Postal" that may help in determing this).

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Aug 11, 2010

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checksecurity.log:

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There also was a lot of terminal output similar to the iMac's which I forgot to save, and when I ran checksecurity again it was blank. (Incidentally, the list of setuid programs on Mac OS is a lot longer)

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Feb 12, 2010

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May 26, 2009

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WPA2 personal is the security type.

There are maybe 4 different ways I know how to connect. The most annoying thing is when this box pops up saying to type in a password for the network connection.. and keeps popping up even when everything is right.

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