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Old 07-13-2017, 02:32 AM   #1
LQ Newbie
Registered: Jul 2011
Posts: 10

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Centos 5 server has slow downloads from Internet - local is great

I've got an old server at home running Centos 5 for some legacy stuff.

Transfers to it from the Internet are kind of slow, around 3MB/sec.
Using wget to pull down a large ISO file go the same speed (3MB/sec)

I can download this same ISO to my PC on the same network and switch at 15MB/sec.
and can download it using another server offsite at 35MB/sec, so it's not the Internet connection or remote server.

I can send data to the old Centos 5 server locally from my PC whether through Windows Explorer(SAMBA) or via FTP at 50MB+/sec. So there isn't a bottleneck on the network.

So something is causing this old server to download from the Internet really slowly but gets data locally plenty fast.

It has a 1000Mbps NIC and connected directly to the 1000Mbps ethernet port on the router. It reports it is active at 1000MBPS.

The MTU is set to 1500 as are my cable modem and router.

Anyone have any ideas? I use this thing for backups so I prefer faster!

Appreciate any help. Thanks
Old 07-13-2017, 03:46 AM   #2
Registered: Dec 2016
Location: Dublin
Distribution: Fedora
Posts: 70

Rep: Reputation: 4

I will make the next tests from your slow centos5
- Check the firewall rules, flush or disable the rules.
- Check the messages of the kernel, may be you have some funny issue on some driver, centos 5 is quite old.
- Capture the traffic in order to see packets delays on it.

Probably this list could grow as people put their solutions
Old 07-17-2017, 03:17 AM   #3
LQ Newbie
Registered: Jul 2011
Posts: 10

Original Poster
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Thanks, I went ahead and loaded a LiveCD of the same version of Centos 5 that's on my server. I then repeated the same tests as on the server and was able to get a MUCH faster download.

At this point I am not fully sure how to proceed. I'm a bit of a novice so all the tests you mentioned above will require some research on my part to complete which won't be easy. Any further help I appreciate.

Btw the NIC on this server is the Realtek RTL8111/RTL8168

Thanks again.
Old 07-17-2017, 04:36 AM   #4
LQ Newbie
Registered: Jul 2011
Posts: 10

Original Poster
Rep: Reputation: Disabled
Ok I just updated driver using the elrepo version and it has no effect. Internet downloads are still slow, about 20% of what they should be.

Here is iptables -L -n

iptables -L -n
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
What else specifically should I look for? Thanks


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