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djinnZ
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Joined: 02 Nov 2006
Posts: 4831
Location: somewhere in L.O.S.
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 Posted: Wed Mar 20, 2013 6:07 pm Post subject: network fault - sigle site unreachable only in linux[solved] |
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Hi, by some days i have a problem with the linux box (and only with them).
I cant connect only to rapidgator.net. Other hosts and sites are ok and there are no problems with other pc's (M$ OS, not linux).
Of course iptables -F not help.
JD, FF and Konq are unable to connect to the site. Any other site or service work fine.
| traceroute www.rapidgator.net: | traceroute to www.rapidgator.net (195.211.223.18), 30 hops max, 60 byte packets
1 router (172.30.0.1) 15.679 ms 15.698 ms 15.845 ms
2 * * *
3 151.6.208.2 (151.6.208.2) 58.839 ms 59.321 ms 59.756 ms
4 151.6.5.114 (151.6.5.114) 60.155 ms 60.544 ms 77.273 ms
5 151.6.3.66 (151.6.3.66) 77.890 ms 95.854 ms 96.253 ms
6 * * *
7 * * *
8 * * *
9 * * *
10 * * *
11 * * *
12 * * *
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * * |
| mtr --report rapidgator.net: | HOST: dite Loss% Snt Last Avg Best Wrst StDev
1.|-- caronte 0.0% 10 8.8 17.3 0.6 55.3 20.9
2.|-- 151.6.208.10 90.0% 10 158.7 158.7 158.7 158.7 0.0
3.|-- 151.6.208.10 80.0% 10 34.3 59.5 34.3 84.7 35.6
4.|-- 151.6.3.162 30.0% 10 35.8 81.0 23.4 163.5 53.4
| `|-- 151.6.5.114
5.|-- 151.6.3.162 60.0% 10 25.7 66.4 25.7 114.2 40.0
6.|-- 151.6.169.72 40.0% 10 878.5 875.3 631.0 1049. 142.1
| `|-- 151.6.208.10
| |-- 151.6.5.114
7.|-- 151.6.169.72 70.0% 10 4.2 538.0 4.2 839.7 463.6
| `|-- 151.6.208.10
| |-- 151.6.3.162
8.|-- 151.6.3.162 80.0% 10 700.6 783.7 700.6 866.8 117.5
| `|-- 151.6.208.10
9.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
10.|-- 151.6.5.114 90.0% 10 1659. 1659. 1659. 1659. 0.0
11.|-- ??? 100.0 9 0.0 0.0 0.0 0.0 0.0 |
| ifconfig: | eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.30.0.6 netmask 255.255.255.240 broadcast 172.30.0.15
ether 20:cf:30:e2:59:46 txqueuelen 1000 (Ethernet)
RX packets 112749 bytes 66383464 (63.3 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 102211 bytes 10616782 (10.1 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
loop txqueuelen 0 (Local Loopback)
RX packets 80 bytes 10032 (9.7 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 80 bytes 10032 (9.7 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 |
| route: | Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default caronte 0.0.0.0 UG 5 0 0 eth1
loopback localhost 255.0.0.0 UG 0 0 0 lo
172.30.0.0 * 255.255.255.240 U 0 0 0 eth1 |
| Code: | # /etc/conf.d.net
# general
modules="iproute2"
# eth0 - wan interface
config_eth0="172.30.0.14/28"
routes_eth0="default gw 172.30.0.1"
ifdown_eth0="yes"
# eth1 - lan interface
#config_eth1="null"
config_eth1="172.30.0.6/28"
routes_eth1="default gw 172.30.0.1"
ifdown_eth1="no" |
Thanks in advice for any suggestion to investigate and solve this strange problem.
_________________
scita et risus abundant in ore stultorum sed etiam semper severi insani sunt
mala tempora currunt...mater stultorum semper pregna est 
Murpy'sLaw:If anything can go wrong, it will - O'Toole's Corollary:Murphy was an optimist
Last edited by djinnZ on Wed Mar 27, 2013 3:55 pm; edited 2 times in total |
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djinnZ
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Joined: 02 Nov 2006
Posts: 4831
Location: somewhere in L.O.S.
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| Posted: Fri Mar 22, 2013 5:50 pm Post subject: |
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up.
I am unable to understand why only one domain and only for the linux box.
The other NICs are disconnected and not used.
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scita et risus abundant in ore stultorum sed etiam semper severi insani sunt
mala tempora currunt...mater stultorum semper pregna est
Murpy'sLaw:If anything can go wrong, it will - O'Toole's Corollary:Murphy was an optimist |
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Fitzcarraldo
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Joined: 30 Aug 2008
Posts: 2034
Location: United Kingdom
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| Posted: Fri Mar 22, 2013 6:13 pm Post subject: |
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I had a similar problem on one of my laptops running Gentoo: I could not access the IMDb site, but every other site was browsable. In my case it turned out to be PLPMTUD (Packetization Layer Path MTU Discovery) and I was able to get my browser to view that site: Why can’t I access a specific Web site?. In case it helps.
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Clevo W230SS: amd64, VIDEO_CARDS="intel modesetting nvidia".
Compal NBLB2: ~amd64, xf86-video-ati. Dual boot Win 7 Pro 64-bit.
OpenRC udev elogind & KDE on both.
Fitzcarraldo's blog |
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djinnZ
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Joined: 02 Nov 2006
Posts: 4831
Location: somewhere in L.O.S.
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| Posted: Sat Mar 23, 2013 11:15 pm Post subject: |
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Sorry for late answer but changing the MTU or using sysctl to set tcp_mtu_probing not help.
_________________
scita et risus abundant in ore stultorum sed etiam semper severi insani sunt
mala tempora currunt...mater stultorum semper pregna est
Murpy'sLaw:If anything can go wrong, it will - O'Toole's Corollary:Murphy was an optimist |
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PaulBredbury
Watchman
Joined: 14 Jul 2005
Posts: 7310
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| Posted: Sun Mar 24, 2013 2:06 am Post subject: |
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Some other sysctl entries to try:
net.ipv4.tcp_window_scaling=0
net.ipv4.netfilter.ip_conntrack_tcp_be_liberal=1 (info) |
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djinnZ
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Joined: 02 Nov 2006
Posts: 4831
Location: somewhere in L.O.S.
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| Posted: Wed Mar 27, 2013 4:04 pm Post subject: |
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I am really unable to find a reasonable cause to this or why but wasinstead of 0
I am not used to /etc/sysctl.conf, because IMHO /etc/sysctl.d is better but ... sorry for mismatch and thanks for the help.
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scita et risus abundant in ore stultorum sed etiam semper severi insani sunt
mala tempora currunt...mater stultorum semper pregna est
Murpy'sLaw:If anything can go wrong, it will - O'Toole's Corollary:Murphy was an optimist |
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