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r0b
n00b
Joined: 20 Jun 2003
Posts: 35
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 Posted: Fri Nov 07, 2003 6:14 am Post subject: SBC Yahoo DSL and firewall |
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Hi all,
I run gentoo on a box w/a DSL connection doing full NAT and packet filtering. I was previously using a cable modem but I moved, and I could not take the cable connection with me, so I had to sign up for DSL.
Ever since I switched, I've noticed a general flakiness in the service. I can barely ever get to www.google.com through a web browser; I can, however, get to Yahoo.com with no problems. There are other sites that will just simply timeout and never resolve the page.
If I try to ping the hosts (the ones I can't get to through a web browser) or connect to them through telnet on port 80, I can get to them without any problems. I know that that would make it sound like a browser issue, but I'm completely convinced it's not. I've tried two different machines with two different browsers and it's the same thing.
I thought it was a firewall problem but I have nothing blocking outgoing traffic, no web proxies, NOTHING. It doesn't make any sense...why would some sites be accessible through a web browser and others not, but all of them accessible through telnetting to port 80 and typing 'GET'?
Sure, I could go to SBC tech support and bitch about it but of course, they're not going to try to troubleshoot my problem unless I have Windows XP and nothing else.
Anyone have an idea/experienced similar problems with SBC Yahoo DSL? |
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NewBlackDak
Guru
Joined: 02 Nov 2003
Posts: 512
Location: Utah County, UT
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| Posted: Fri Nov 07, 2003 8:32 am Post subject: |
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| looks like a name server issue to me. Did one of the connections have a static IP, and the other DHCP? |
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jaska
Bodhisattva
Joined: 06 Jun 2003
Posts: 725
Location: Finland
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| Posted: Fri Nov 07, 2003 7:33 pm Post subject: |
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| As NewBlackDak said it could just be a nameserver issue or sbc just having routing problems. I assume you use rp-pppoe to connect the nat box with the adsl line? |
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HeartBreakKid
Tux's lil' helper
Joined: 13 Jun 2003
Posts: 76
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| Posted: Fri Nov 07, 2003 8:02 pm Post subject: |
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| I have SBC DSL and have had no such problems. |
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r0b
n00b
Joined: 20 Jun 2003
Posts: 35
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| Posted: Fri Nov 07, 2003 11:37 pm Post subject: |
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| jaska wrote: | | As NewBlackDak said it could just be a nameserver issue or sbc just having routing problems. I assume you use rp-pppoe to connect the nat box with the adsl line? |
I tried rp-pppoe but didn't get it to work, so I found another way to do it here in the forums and everything works fine but of course I still have those DNS issues. I'm trying to rule everything out on my end so I guess that maybe it is SBC?
One thing is for sure: I miss my cable modem  |
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Doctor Awesome
n00b
Joined: 23 Nov 2003
Posts: 1
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| Posted: Sun Nov 23, 2003 11:38 pm Post subject: MTU |
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You probably need to set your MTU...
Default is 1500 I think.. I had to set mine to 1454 to get such pages to load properly.
I had to do:
| Code: | | ifconfig eth0 mtu 1454 |
You might try that, and if it doesn't do anything, just change it back to 1500.
I'm afraid I can't offer any technical details on this, but maybe someone else can. I have SBC DSL too.
Good luck! |
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