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r0b
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Joined: 20 Jun 2003
Posts: 35

PostPosted: Fri Nov 07, 2003 6:14 am    Post subject: SBC Yahoo DSL and firewall Reply with quote

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
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Joined: 02 Nov 2003
Posts: 512
Location: Utah County, UT

PostPosted: Fri Nov 07, 2003 8:32 am    Post subject: Reply with quote

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
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Joined: 06 Jun 2003
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Location: Finland

PostPosted: Fri Nov 07, 2003 7:33 pm    Post subject: Reply with quote

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
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Joined: 13 Jun 2003
Posts: 76

PostPosted: Fri Nov 07, 2003 8:02 pm    Post subject: Reply with quote

I have SBC DSL and have had no such problems.
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r0b
n00b
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Joined: 20 Jun 2003
Posts: 35

PostPosted: Fri Nov 07, 2003 11:37 pm    Post subject: Reply with quote

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
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Joined: 23 Nov 2003
Posts: 1

PostPosted: Sun Nov 23, 2003 11:38 pm    Post subject: MTU Reply with quote

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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