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sfabius
Tux's lil' helper
Joined: 15 Nov 2002
Posts: 80
Location: Pittsburgh, PA
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 Posted: Fri May 27, 2005 8:38 pm Post subject: can't access university domain over pppoe from home [solved] |
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I have a laptop that I use at work (University of Pittsburgh) and at home. At work, it connnects ethernet eth0 with a fixed IP address.
At home, I recently got DSL (yay), and am connected using pppoe. I can ping and access anything outside the university domain, but nothing inside the domain (or in the IP address domain -- 136.142.XXX.XXX). I've tried setting iface_eth0="up" in /etc/conf.d/net, but the IP address comes back even after I bring up eth0. My wife's windows laptop connects to these websites without any trouble.
I'm using Firestarter to run a firewall but I verything open going out.
So i think there's something where the university won't accept connections from a 136.142 IP address when it clearly comes from outside the university (the university tech people can't seem to even figure out my problem -- they keep telling me to call my DSL provider). But I don't know how to fix this. I'd like to get it so I can have one setup for home and one for work. I have different login scripts for whether I am at work or at home. Can somebody help me figure out what to do next?
(I've done some searching here, but it was hard to know what to search for; apologies and thanks if you can find me a topic on this.)
Last edited by sfabius on Fri May 27, 2005 11:12 pm; edited 1 time in total |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 55293
Location: 56N 3W
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| Posted: Fri May 27, 2005 8:51 pm Post subject: |
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sfabius,
Can you traceroute to a Uni IP you know works, to see where your packets are being dropped?
if needed.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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sfabius
Tux's lil' helper
Joined: 15 Nov 2002
Posts: 80
Location: Pittsburgh, PA
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| Posted: Fri May 27, 2005 9:00 pm Post subject: |
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Here (this is to the IP I usually use as my gateway -- 136.142.130.1):
| Code: | traceroute to hsrp-vlan130-130.gw.pitt.edu (136.142.130.1), 30 hops max, 40 byte packets
1 spare5.linguist.pitt.edu (136.142.130.89) 2999.797 ms !H 3000.260 ms !H 3000.720 ms !H
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"spare5" is the name of my machine
[is it safe to put my IP address up here or should I X part of it out?] |
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sfabius
Tux's lil' helper
Joined: 15 Nov 2002
Posts: 80
Location: Pittsburgh, PA
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| Posted: Fri May 27, 2005 9:09 pm Post subject: |
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BTW, I tried changing my eth0 to ifconfig_eth0="up". When I did /etc/init.d/net.eth0, I get: | Code: | | * Keeping kernel configuration for eth0 |
What's that? |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 55293
Location: 56N 3W
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| Posted: Fri May 27, 2005 10:08 pm Post subject: |
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sfabius,
That traceroute would be OK if you were on the Uni but from home it should be more like this from home.
I'm in the UK, so you will have less 'hops' | Code: | $ /usr/sbin/traceroute 136.142.130.1
traceroute to hsrp-vlan130-130.gw.pitt.edu (136.142.130.1), 30 hops max, 38 byte packets
1 Moriarty (192.168.100.1) 0.421 ms 0.196 ms 0.188 ms
2 adsl (62.3.120.142) 1.171 ms 1.714 ms 1.050 ms
3 gadamer-dsl.zen.net.uk (62.3.83.3) 21.751 ms 21.161 ms 21.890 ms
4 bolzano-ge-0-0-1-1.wh.zen.net.uk (62.3.80.225) 22.086 ms 21.113 ms 22.007 ms
5 195.16.169.89 (195.16.169.89) 20.060 ms 20.929 ms 19.923 ms
6 so-4-1-0.mp1.Manchesteruk1.Level3.net (4.68.113.101) 22.144 ms 20.887 ms 21.939 ms
7 so-1-1-0.bbr1.London1.Level3.net (4.68.128.73) 28.054 ms ae-1-0.bbr2.London1.Level3.net (212.187.128.57) 29.451 ms so-1-1-0.bbr1.london1.level3.net (4.68.128.73) 28.984 ms
8 ge-6-0.core1.London1.Level3.net (212.187.131.45) 27.181 ms ge-1-2.core1.london1.level3.net (212.187.131.165) 29.274 ms ge-6-0.core1.london1.level3.net (212.187.131.45) 29.116 ms
9 ge-5-0-0.ar2.LON3.gblx.net (208.51.239.161) 29.698 ms 29.327 ms 27.738 ms
10 so0-0-0-2488M.ar3.jfk1.gblx.net (67.17.72.30) 96.427 ms 94.863 ms 96.044 ms
11 Pittsburgh-Supercomputing.so-2-1-1.ar3.JFK1.gblx.net (208.50.254.46) 118.203 ms 117.320 ms 117.645 ms
12 bar-ge-4-3-0-0.3rox.net (192.88.115.1) 117.765 ms 117.286 ms 117.858 ms
13 pitt-cl-i1.3rox.net (192.88.115.149) 118.092 ms 117.006 ms 117.648 ms
14 cl2-vlan712.gw.pitt.edu (136.142.2.162) 115.973 ms 116.937 ms 117.688 ms
15 cl1-cl2-pp.gw.pitt.edu (136.142.253.222) 119.999 ms * * |
It looks like you are trying to use your Uni static IP from home and can't because your ISP does not know how to route it.
What does show when you are at home?
and /etc/resolv.conf
You need two completely different set-ups
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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sfabius
Tux's lil' helper
Joined: 15 Nov 2002
Posts: 80
Location: Pittsburgh, PA
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| Posted: Fri May 27, 2005 10:21 pm Post subject: |
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Thanks -- I know I need two setups but the damn thing seems to keep the Uni setup even when I change /etc/conf.d/net. I guess I just need to kow exactly what needs to change from home. I just use adsl-setup and adsl-start.
| Code: | # route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.6.8.1 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
136.142.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
127.0.0.0 127.0.0.1 255.0.0.0 UG 0 0 0 lo
0.0.0.0 10.6.8.1 0.0.0.0 UG 0 0 0 ppp0
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| Code: | # cat /etc/resolv.conf
nameserver 151.201.0.39
nameserver 151.201.0.38
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And my current /etc/conf.d/net (note commented out parts that I use for the Uni; I changed it to this and then restarted net.eth0 . | Code: | # cat /etc/conf.d/net
# /etc/conf.d/net:
# $Header: /home/cvsroot/gentoo-src/rc-scripts/etc/conf.d/net,v 1.7 2002/11/18 19:39:22 azarah Exp $
# Global config file for net.* rc-scripts
# This is basically the ifconfig argument without the ifconfig $iface
#
#iface_eth0="136.142.130.89 broadcast 136.142.255.255 netmask 255.255.0.0"
ifconfig_eth0="dhcp"
# For setting the default gateway
#
#gateway="eth0/136.142.130.1"
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I've also tried iface_eth0="up". |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 55293
Location: 56N 3W
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| Posted: Fri May 27, 2005 10:41 pm Post subject: |
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sfabius,
Ah!
| Code: | Destination Gateway Genmask Flags Metric Ref Use Iface
10.6.8.1 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
136.142.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0 |
When you are at home,
you are still sending Uni bound packets to eth0, which is why they don't reach the Uni.
You need to remove that line from your routing table. From your setup, its not clear how it got there.
| Code: | | route del 136.142.0.0/16 |
is what you need. Then you should be in businnes because Uni bound packets will be sent to your defualt gateway.
Next is to automate it.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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sfabius
Tux's lil' helper
Joined: 15 Nov 2002
Posts: 80
Location: Pittsburgh, PA
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| Posted: Fri May 27, 2005 10:50 pm Post subject: |
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OK, thanks, let's try that:
| Code: | # route del 136.142.0.0/16
route: netmask 0000ffff doesn't make sense with host route
Usage: route [-nNvee] [-FC] [<AF>] List kernel routing tables
route [-v] [-FC] {add|del|flush} ... Modify routing table for AF.
blah blah blah
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Maybe:
| Code: | # route del 136.142.0.0
SIOCDELRT: No such process
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??? |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 55293
Location: 56N 3W
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| Posted: Fri May 27, 2005 11:02 pm Post subject: |
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sfabius,
Try | Code: | | route del -net 136.142.0.0 |
or | Code: | | route del -net 136.142.0.0/16 |
with or without eth0 on the end.
The IP address 136.142.0.0 cannot be a host route, since its a network address, so I don't understand the error.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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sfabius
Tux's lil' helper
Joined: 15 Nov 2002
Posts: 80
Location: Pittsburgh, PA
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| Posted: Fri May 27, 2005 11:11 pm Post subject: |
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Got it, thanks! It works.
I have eth0 come up at boot, and then when I log into X I have an "Xhome" script that takes it down. Is that the problem? Should I just put the "route del" command in that script? |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 55293
Location: 56N 3W
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| Posted: Fri May 27, 2005 11:15 pm Post subject: |
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sfabius,
Yes, that will be the problem. The route does not get deleted when you take the interface down.
Adding theis probably as good a way to fix it as any.
If you do not use eth0 at home, you may want to look at ifplug, which sets up networking 'on the fly' depending if the link on eth0 is alive (plugged in) or not.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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sfabius
Tux's lil' helper
Joined: 15 Nov 2002
Posts: 80
Location: Pittsburgh, PA
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| Posted: Fri May 27, 2005 11:19 pm Post subject: |
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| OK I'll look into ifplug. Thanks for your help! |
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