slow internet with firewall ipv4 disabled

Hello every one,

I have a strange problem with my internet connectivity, it’s slow (both ethernet and wireless). I faced this issue with 10.3 but I could not find a solution so I installed 11.1 as a freshh install I thought this woud solve it but it’s still an issue. The firewall and ipv6 are disabled. so what you think?

NOTE: This issue comes after my ISP forced me to upgrade my wimax router (it’s a myungmin WiMAX CPE Ver v1.436).

You never ever disable the firewall, it only helps in blocking unnecessary traffic on your line. Immediately enable the firewall…

First thing i’d try is to ping any website from console. If the ping is ok then i’d suspect DNS servers.

Thank you BenderBendingRodriguez for your reply but there is no problem with ping as I tried it with name and IP but they are approx. the same.

PING ( 56(84) bytes of data.
64 bytes from ( icmp_seq=1 ttl=45 time=261 ms
64 bytes from ( icmp_seq=2 ttl=45 time=238 ms
64 bytes from ( icmp_seq=3 ttl=45 time=238 ms
64 bytes from ( icmp_seq=4 ttl=45 time=393 ms
64 bytes from ( icmp_seq=5 ttl=45 time=230 ms
64 bytes from ( icmp_seq=6 ttl=45 time=245 ms

--- ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 8705ms
rtt min/avg/max/mdev = 230.372/268.027/393.202/56.825 ms
PING ( 56(84) bytes of data.
64 bytes from icmp_seq=2 ttl=45 time=269 ms
64 bytes from icmp_seq=3 ttl=45 time=339 ms
64 bytes from icmp_seq=4 ttl=45 time=225 ms
64 bytes from icmp_seq=5 ttl=45 time=227 ms
64 bytes from icmp_seq=6 ttl=45 time=250 ms

--- ping statistics ---
6 packets transmitted, 5 received, 16% packet loss, time 5018ms
rtt min/avg/max/mdev = 225.908/262.653/339.908/41.770 ms

and for the DNS it was only the followng line


but I edited /etc.resolv.conf and now it contains


where the 2 last nameservers are taken from the router which are my ISP DNS server

Some things are not caused by the OS, the DNS address is your router which manages the conversion as you are behind NAT then the router manages all the traffic and DNS queries. There is no need to add those DNS servers. I would be more worried about the ping which is really big and that does not depend on your OS. When opening a website you send many requests for data so if every request takes so long to get there then it will take a looooooong time to load the whole website, You can’t do much here except to change your ISP :wink:

P.S. For example i have an average ping of ~34. Of course it depends on the website and where is the server based but generally your ping should not exceed 60-70ms

Thank you for your cooperation but it’s not the time taken I just made sure with my brother’s desktop (win xp) and it was approx. the same time to reach and he’s downloading at 200+ (I only get 8-16 kbps) kbps so it’s definitley not the time taken. Doesn’t upgrading router firmware while some devices are conneced an issue?

I forgot to mention sometimes when I check speed with I got the whole speed but not when browsing or downloading (I now running zypper dup and until now it takes only 13 hours and the download size was less than 500MB )

Then as i said, the DNS servers may be crappy because browsing depends completely on a DNS server, downloading does not as if im right connect without DNS server because it doesn’t need the name > IP translation. Updating firmware hmmm, it’s best to do it through cable. I don’t think any other trafiic may affect it since even 10Mb would be enough to accomplish many things.

Also you may have a bad signal. Is your signal strong? The weaker the signal the smaller the speed and the more lost packets. I noticed you ahd a lost packet earlier when you showed me the output of ping command. I suspect that you may have a weak signal. Try to move the router somewhere, near the window etc. experiment with it.

Forget the ping time what is that packet loss about.

Being as far removed from a network guru as you can imagine, with a bit of google fu I got here Cable Modem Troubleshooting Tips: Packet Loss

Though being cable modem specific and vaguely windows based, I would of though the troubleshooting aspects of it would be similar i.e duplex negotiation, window scaling, mtu.

Its unlikely to be anything to do with dns lookup as this will be caching and will only effect the initial lookup time. My instinct suggests either the duplex is out or the mtu.

I guess any wireless router be it WiMax or WiFi is Half Duplex. Only cables are full duplex?

Mmm wouldn’t know I ended up in a complete adventure and can tell you the router/wifi thingy in question is using tdd what ever that is which is running on half duplex but as full duplex shrug.

I’ve only got a few snippets from google the half and full whilst seems to be related to speed, going on wiki this isn’t quite correct. iirc half is one way traffic full both ways and tdd the same as full on half.

Read wiki and you’ll know as much as I do.

I thing any wireless adapters are half duplex since full duplex would create problems (interference mainly).

I am aware what half, full duplex are :slight_smile:

But i’m not sure if WiMax routers/adapters are half or full duplex but i’m pretty sure they are half duplex. Anyway, he may have a weak signal which is between the router and his ISP’s broadcasting antenna. To further troubleshoot it i’d connect your brother’s PC to your router and check if it’s the same situation.

I told you the router in question is TDD Duplex (telecommunications) - Wikipedia, the free encyclopedia so neither full or half if we’re getting picky, though in theory it is half duplex emulating full.

Note the OP said both ethernet and wireless to.

Well duh because he connects to the router either wirelessly or through a cable :)?? And the problem exists between the router and the ISP…

Not necessarily so but I some how doubt his brother is using a different isp :wink:

At least I don’t claim to know it all.

A dual boot would prove it or not as you pointed out but lets say he comes back and say yes windows works fine where are you going next? Which he already has…

Anyway, this is not OS issue, tell us what is your MTU on this router by logging onto it (are you allowed to do that? I’m asking as some ISP’s don’t allow to tamper in any way with the router).

As you noticed this appeared after an upgrade so this is the router’s fault:)

P.S. Tell your brother to stop downloading :wink: If you download something with a P2P client then decrease the upload speed to approx. 60% of your upload speed or you will suffer in both ways (also decrease amount of half open connections). Half duplex connections suffer from such things.

Mmm where does he say that?

He’s had th problem since 10.3 install, mtu on the router I would of thought would effect windows to, now the mtu on Suse wouldn’t.

Duplex mis-match could fit the symptoms y’all describe i.e slower than expected etc., see here for ethernetand particularly “effects of”. Just a suggestion. :slight_smile:

Ok, sorry for being late to reply I was outside home. Thank you all for interesting in helping and spread knowledge.

And I want to tell you that now I can surf perfectly and download (with JDownloader) as it was before with 80+ kbps. What I did are the following 2 steps (I do not know if one of them or both of them did the trick)

# ifdown-dhcp wlan0
# iwconfig wlan0 essid "*****" channel X rate 54M key ********
# ifup-dhcp wlan0
where: X is channel on the router (3 in my case)
       54M because it's maximum of the router

I follwed the firefox tweak from:

and since konqueror’s speed also has increased I think “rate” and may be the “channel” commands did the trick.

but unfortunately zypper still has the issue and I dont know what to do to fix it. I wounder if there is a way to increase the number of connection zypper use to connect to a repo and I googled but without any success, so if you know it exists please help me.

I am looking for your help. Thanks

Hello again,

I found something I didn’t pay attention for, the ftp downloads are super fast but not the http ones. What causes make ftp super faster than http?

I want to tell you that I changed mtu to 1400 which make packect loss less than before and change some tcp-* variable depending on some tutorials but still have the slow downloads (even youtube is slow).

I hope you can direct me to solve this problem.

NOTE: This problem is also existed with macbook owner who is subscribed to the same service I am subscribed to but the ISP has nothing to do with mac and linux users since they are nothing in numbers compared to windows users

Addition: since windows machines have good downloads, can I get sone settings from them? which ones?