troubleshooting Question

IPTables Mangle Table Slows Down Connection when Uploading Large Files

Avatar of jkockler
jkocklerFlag for United States of America asked on
Linux NetworkingLinuxNetworking
6 Comments3 Solutions292 ViewsLast Modified:
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?
ASKER CERTIFIED SOLUTION
Duncan Roe
Software Developer

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