We help IT Professionals succeed at work.
Get Started

IPTables Mangle Table Slows Down Connection when Uploading Large Files

286 Views
Last Modified: 2016-09-04
Greetings,

I am using Linux as a router, IPTables / Netfilter.

I have run into a problem with the MANGLE table rules slowing down the internet connection to a crawl when uploading files with various cloud based backup software. If I remove the Mangle table rules, the problem resolves. With the MANGLE rules in place and while uploading files, my ping times to google for example, are consistently above 500ms. If I remove the MANGLE rules, ping times are normal 14ms - 50ms.

The purpose of my mangle rules are to prioritize SIP and RTP traffic for VoIP, and then all else to the default queue.

Here are my mangle table rules:

-A PREROUTING -p udp -m udp --dport 10000:21099 -j MARK --set-xmark 0x1/0xffffffff
-A PREROUTING -p udp -m udp --dport 10000:21099 -j RETURN
-A PREROUTING -p udp -m udp --dport 5060:5099 -j MARK --set-xmark 0x1/0xffffffff
-A PREROUTING -p udp -m udp --dport 5060:5099 -j RETURN
-A PREROUTING -j MARK --set-xmark 0x2/0xffffffff
-A PREROUTING -j RETURN


Any ideas on how I can speed up the packets through the mangle table?
Comment
Watch Question
Software Developer
CERTIFIED EXPERT
Commented:
This problem has been solved!
Unlock 3 Answers and 6 Comments.
See Answers
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE