| View previous topic :: View next topic |
| Author |
Message |
meal
n00b
Joined: 20 Nov 2006
Posts: 65
Location: Silesia / Poland
|
 Posted: Thu Jul 23, 2009 9:10 am Post subject: [SOLVED] Router can't reach some destinations. |
 |
|
Topic not related to gentoo, but really fills in this category.
My problem is, after upgrading my WAN "interface" from USB modem Thomson Speedtouch 330 to adsl router Speedtouch ST06, reaching some sites. For example: forums.gentoo.org (no I'm running on socks proxy on my external server). While icmp packets reaching destination, that tcp can't. I diagnosed that with tcptraceroute and "normal" traceroute too. Trace to destination host exceeds 30 hops (wtf?) , when previously it was only 21-22 max.
I have no idea how to solve this problem, because web interface of this router is so simply, so I can't find any proper options. I've also have access to CLI, but it sucks so much....
Any ideas what it might be?
_________________
http://www.mkozak.pl
http://blog.mkozak.pl
Last edited by meal on Wed Jul 29, 2009 1:17 pm; edited 1 time in total |
|
| Back to top |
|
 |
think4urs11
Bodhisattva
Joined: 25 Jun 2003
Posts: 6659
Location: above the cloud
|
| Posted: Thu Jul 23, 2009 12:49 pm Post subject: |
|
|
wild guess: check MTU settings
_________________
Nothing is secure / Security is always a trade-off with usability / Do not assume anything / Trust no-one, nothing / Paranoia is your friend / Think for yourself |
|
| Back to top |
|
|
meal
n00b
Joined: 20 Nov 2006
Posts: 65
Location: Silesia / Poland
|
| Posted: Thu Jul 23, 2009 3:02 pm Post subject: |
|
|
It was what I've checked first. It's 1500 and I think that is proper value for ATM device (PPPoA exactly).
_________________
http://www.mkozak.pl
http://blog.mkozak.pl |
|
| Back to top |
|
|
papahuhn
l33t
Joined: 06 Sep 2004
Posts: 626
|
| Posted: Thu Jul 23, 2009 4:55 pm Post subject: |
|
|
Try with 1462.
_________________
Death by snoo-snoo! |
|
| Back to top |
|
|
meal
n00b
Joined: 20 Nov 2006
Posts: 65
Location: Silesia / Poland
|
| Posted: Fri Jul 24, 2009 10:50 am Post subject: |
|
|
Hi,
thank you for solution, I've tried to change MTU for device on which problem exists and still doesn't work..
here is my traceroute to forums.gentoo.org:
| Code: | meal@oziris ~ $ traceroute forums.gentoo.org
traceroute to forums.gentoo.org (140.211.166.170), 30 hops max, 60 byte packets
1 192.168.0.254 (192.168.0.254) 63.250 ms 62.673 ms 62.294 ms
2 kat-ru1.neo.tpnet.pl (213.25.2.205) 20.069 ms 22.601 ms 24.415 ms
3 ge-1-1-0.kat-r2.tpnet.pl (213.25.5.185) 27.318 ms 29.709 ms 32.390 ms
4 xe-6-1-1-0.ffttr2.Frankfurt.opentransit.net (193.251.255.249) 65.392 ms 67.232 ms 70.363 ms
5 xe-4-2-0.edge3.frankfurt1.level3.net (4.68.127.197) 75.284 ms 77.699 ms xe-8-3-0.edge3.frankfurt1.level3.net (4.68.111.233) 80.668 ms
6 vlan79.csw2.Frankfurt1.Level3.net (4.68.23.126) 92.737 ms vlan89.csw3.Frankfurt1.Level3.net (4.68.23.190) 66.140 ms vlan79.csw2.Frankfurt1.Level3.net (4.68.23.126) 71.207 ms
7 ae-62-62.ebr2.Frankfurt1.Level3.net (4.69.140.17) 66.406 ms ae-72-72.ebr2.Frankfurt1.Level3.net (4.69.140.21) 67.938 ms 67.031 ms
8 ae-44-44.ebr2.Washington1.Level3.net (4.69.137.62) 174.011 ms 152.419 ms ae-43-43.ebr2.Washington1.Level3.net (4.69.137.58) 152.882 ms
9 ae-2-2.ebr2.Chicago2.Level3.net (4.69.132.69) 151.758 ms 156.336 ms 158.211 ms
10 ae-1-100.ebr1.Chicago2.Level3.net (4.69.132.113) 162.769 ms 168.074 ms 170.774 ms
11 ae-3.ebr2.Denver1.Level3.net (4.69.132.61) 205.821 ms 206.501 ms 207.172 ms
12 (4.69.132.53) 248.617 ms 249.308 ms 249.975 ms
13 (4.68.105.39) 251.984 ms 213.330 ms 216.297 ms
14 UNIVERSITY.edge5.Seattle1.Level3.net (63.211.200.246) 225.532 ms 229.214 ms 222.472 ms
15 corv-car1-gw.nero.net (207.98.64.177) 227.896 ms 233.534 ms 235.484 ms
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
meal@oziris ~ $
|
and tcptraceroute result to this same host:
| Code: |
tcptraceroute forums.gentoo.org
Selected device eth0, address 192.168.0.3, port 45684 for outgoing packets
Tracing the path to forums.gentoo.org (140.211.166.170) on TCP port 80 (http), 30 hops max
1 192.168.0.1 0.322 ms 0.235 ms 0.258 ms
2 192.168.0.254 42.854 ms 99.818 ms
kat-ru1.neo.tpnet.pl (213.25.2.205) 14.920 ms
3 ge-1-1-0.kat-r2.tpnet.pl (213.25.5.185) 25.065 ms 14.527 ms 12.876 ms
4 xe-6-1-1-0.ffttr2.Frankfurt.opentransit.net (193.251.255.249) 43.326 ms 43.451 ms 143.588 ms
5 xe-4-2-0.edge3.frankfurt1.level3.net (4.68.127.197) 46.413 ms
xe-8-3-0.edge3.frankfurt1.level3.net (4.68.111.233) 45.990 ms 46.017 ms
6 vlan79.csw2.Frankfurt1.Level3.net (4.68.23.126) 46.574 ms 77.565 ms
vlan89.csw3.Frankfurt1.Level3.net (4.68.23.190) 115.383 ms
7 ae-82-82.ebr2.Frankfurt1.Level3.net (4.69.140.25) 45.686 ms 47.044 ms 46.225 ms
8 ae-44-44.ebr2.Washington1.Level3.net (4.69.137.62) 153.931 ms 152.356 ms 152.598 ms
9 ae-2-2.ebr2.Chicago2.Level3.net (4.69.132.69) 153.252 ms 150.425 ms 150.894 ms
10 ae-1-100.ebr1.Chicago2.Level3.net (4.69.132.113) 152.512 ms 151.111 ms 152.476 ms
11 ae-3.ebr2.Denver1.Level3.net (4.69.132.61) 182.780 ms 185.216 ms 196.963 ms
12 ae-2.ebr2.Seattle1.Level3.net (4.69.132.53) 215.814 ms 224.837 ms 210.882 ms
13 ge-11-0.hsa2.Seattle1.Level3.net (4.68.105.39) 211.733 ms 218.396 ms 219.373 ms
14 UNIVERSITY.edge5.Seattle1.Level3.net (63.211.200.246) 215.535 ms 214.878 ms 215.113 ms
15 corv-car1-gw.nero.net (207.98.64.177) 217.334 ms 218.659 ms 217.872 ms
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
Destination not reached
|
_________________
http://www.mkozak.pl
http://blog.mkozak.pl |
|
| Back to top |
|
|
eccerr0r
Watchman
Joined: 01 Jul 2004
Posts: 9932
Location: almost Mile High in the USA
|
| Posted: Tue Jul 28, 2009 6:55 pm Post subject: |
|
|
It's possible the machines past that have some ICMP filtered.
I can't traceroute to forums.gentoo.org either, and stops at the same place your trace stops at.
_________________
Intel Core i7 2700K/Radeon R7 250/24GB DDR3/256GB SSD
What am I supposed watching? |
|
| Back to top |
|
|
krinn
Watchman
Joined: 02 May 2003
Posts: 7471
|
| Posted: Tue Jul 28, 2009 8:43 pm Post subject: |
|
|
i don't have a solve for you, but you should check that:
| Quote: | | 1 192.168.0.254 (192.168.0.254) 63.250 ms 62.673 ms 62.294 ms |
| Quote: | | 2 192.168.0.254 42.854 ms 99.818 ms |
That's a shitty answer for a router,
here's mine | Code: | | 1 192.168.0.100 7.149 ms 7.985 ms 8.701 ms |
and it looks more what you may expect from a device that is plug near your network card.
and look the 2. that ip respond faster than your own router  | Code: |
1 192.168.0.254 (192.168.0.254) 63.250 ms 62.673 ms 62.294 ms
2 kat-ru1.neo.tpnet.pl (213.25.2.205) 20.069 ms 22.601 ms 24.415 ms |
You should dig that (even it have nothing to do with gentoo forum not answering, it might have to do with long delays and/or hardware failure) |
|
| Back to top |
|
|
ScarletPimpFromHell
n00b
Joined: 15 May 2007
Posts: 32
Location: Sydney
|
| Posted: Tue Jul 28, 2009 9:55 pm Post subject: |
|
|
You will probably have to use the TCP "set Maximum Segment Size" IP option.
In Australia the MTU size of a PPPoA circuit is 1492 bytes, thats 1500 minus the 8 byte PPP header & trailer.
So if you are using PPPoA then deduct another 20 bytes for the IP header and then another 20 bytes for the TCP header. That leaves you with a 1452 byte payload.
I don't know how to set the MSS option on a speedtouch, but you should be looking at around a figure of 1452 bytes.
_________________
n00b indeed !
Such a cruel cruel world we live in. |
|
| Back to top |
|
|
meal
n00b
Joined: 20 Nov 2006
Posts: 65
Location: Silesia / Poland
|
| Posted: Wed Jul 29, 2009 1:20 pm Post subject: |
|
|
Hi guys,
Thank you all for help and advices. I've solved the problem, but the way which I did it a little bit weird. What I did, is restore configuration to default, and configure device once again from zero. Now I have many work with port forwarding (I've got server behind this router, and need almost 50 ports forwarded) but everything works fine. Now I'm writing this post without any proxies between me and forums.gentoo.org server..
Happy Meal 
_________________
http://www.mkozak.pl
http://blog.mkozak.pl |
|
| Back to top |
|
|
|
Networking & Security
