CentOS5.7 network not always connect
Posted by alancy on 2012/2/18 5:47:57
Hello there,
I installed CentOS5.7 freshly and did all updates. however my network connect do not work properly: it does not always connect.
- I can see the interruptions (between seq=6 and seq=45) when I ping linux2 (192.168.1.102) in the LAN:
*************
PING 192.168.1.102 (192.168.1.102) 56(84) bytes of data.
64 bytes from 192.168.1.102: icmp_seq=1 ttl=64 time=2.86 ms
64 bytes from 192.168.1.102: icmp_seq=2 ttl=64 time=0.356 ms
64 bytes from 192.168.1.102: icmp_seq=3 ttl=64 time=0.347 ms
64 bytes from 192.168.1.102: icmp_seq=4 ttl=64 time=0.356 ms
64 bytes from 192.168.1.102: icmp_seq=5 ttl=64 time=0.348 ms
64 bytes from 192.168.1.102: icmp_seq=6 ttl=64 time=0.348 ms <<<<<<<
64 bytes from 192.168.1.102: icmp_seq=45 ttl=64 time=1004 ms <<<<<<<<
64 bytes from 192.168.1.102: icmp_seq=46 ttl=64 time=4.61 ms
64 bytes from 192.168.1.102: icmp_seq=47 ttl=64 time=0.351 ms
******************
- I can ssh linux2, but lost response in every minute. The same thing happens when I ssh this machine from linux2.
- I can access Internet, but lost connection from time to time.
- I turn off firewall, not work.
- I also have Window7 installed in this machine and every thing is fine when I using Windows7 for Internet connection and ssh to linux2, so that I am assuming the hardware should not be a problem. This is a brand new PC.
Any help and suggestions are highly appreciated.
Thanks
Alancy
my system information
I installed CentOS5.7 freshly and did all updates. however my network connect do not work properly: it does not always connect.
- I can see the interruptions (between seq=6 and seq=45) when I ping linux2 (192.168.1.102) in the LAN:
*************
PING 192.168.1.102 (192.168.1.102) 56(84) bytes of data.
64 bytes from 192.168.1.102: icmp_seq=1 ttl=64 time=2.86 ms
64 bytes from 192.168.1.102: icmp_seq=2 ttl=64 time=0.356 ms
64 bytes from 192.168.1.102: icmp_seq=3 ttl=64 time=0.347 ms
64 bytes from 192.168.1.102: icmp_seq=4 ttl=64 time=0.356 ms
64 bytes from 192.168.1.102: icmp_seq=5 ttl=64 time=0.348 ms
64 bytes from 192.168.1.102: icmp_seq=6 ttl=64 time=0.348 ms <<<<<<<
64 bytes from 192.168.1.102: icmp_seq=45 ttl=64 time=1004 ms <<<<<<<<
64 bytes from 192.168.1.102: icmp_seq=46 ttl=64 time=4.61 ms
64 bytes from 192.168.1.102: icmp_seq=47 ttl=64 time=0.351 ms
******************
- I can ssh linux2, but lost response in every minute. The same thing happens when I ssh this machine from linux2.
- I can access Internet, but lost connection from time to time.
- I turn off firewall, not work.
- I also have Window7 installed in this machine and every thing is fine when I using Windows7 for Internet connection and ssh to linux2, so that I am assuming the hardware should not be a problem. This is a brand new PC.
Any help and suggestions are highly appreciated.
Thanks
Alancy
my system information
== BEGIN uname -rmi ==
2.6.18-274.18.1.el5xen i686 i386
== END uname -rmi ==
== BEGIN rpm -qa \*-release\* ==
adobe-release-i386-1.0-1
centos-release-notes-5.7-0
centos-release-5-7.el5.centos
== END rpm -qa \*-release\* ==
== BEGIN cat /etc/redhat-release ==
CentOS release 5.7 (Final)
== END cat /etc/redhat-release ==
== BEGIN getenforce ==
Permissive
== END getenforce ==
== BEGIN free -m ==
total used free shared buffers cached
Mem: 7334 1271 6062 0 64 625
-/+ buffers/cache: 582 6751
Swap: 16383 0 16383
== END free -m ==
== BEGIN lspci -nn ==
00:00.0 Host bridge [0600]: Advanced Micro Devices [AMD] RS780 Host Bridge [1022:9600]
00:01.0 PCI bridge [0604]: ASUSTeK Computer Inc. RS880 PCI to PCI bridge (int gfx) [1043:9602]
00:04.0 PCI bridge [0604]: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE port 0) [1022:9604
]
00:07.0 PCI bridge [0604]: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE port 3) [1022:9607
]
00:0a.0 PCI bridge [0604]: Advanced Micro Devices [AMD] RS780/RS880 PCI to PCI bridge (PCIE port 5) [102
2:9609]
00:11.0 SATA controller [0106]: ATI Technologies Inc SB7x0/SB8x0/SB9x0 SATA Controller [IDE mode] [1002:
4390]
00:12.0 USB Controller [0c03]: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB OHCI0 Controller [1002:4397]
00:12.1 USB Controller [0c03]: ATI Technologies Inc SB7x0 USB OHCI1 Controller [1002:4398]
00:12.2 USB Controller [0c03]: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB EHCI Controller [1002:4396]
00:13.0 USB Controller [0c03]: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB OHCI0 Controller [1002:4397]
00:13.1 USB Controller [0c03]: ATI Technologies Inc SB7x0 USB OHCI1 Controller [1002:4398]
00:13.2 USB Controller [0c03]: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB EHCI Controller [1002:4396]
00:14.0 SMBus [0c05]: ATI Technologies Inc SBx00 SMBus Controller [1002:4385] (rev 3c)
00:14.1 IDE interface [0101]: ATI Technologies Inc SB7x0/SB8x0/SB9x0 IDE Controller [1002:439c]
00:14.2 Audio device [0403]: ATI Technologies Inc SBx00 Azalia (Intel HDA) [1002:4383]
00:14.3 ISA bridge [0601]: ATI Technologies Inc SB7x0/SB8x0/SB9x0 LPC host controller [1002:439d]
00:14.4 PCI bridge [0604]: ATI Technologies Inc SBx00 PCI to PCI Bridge [1002:4384]
00:14.5 USB Controller [0c03]: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB OHCI2 Controller [1002:4399]
00:18.0 Host bridge [0600]: Advanced Micro Devices [AMD] Family 15h Processor Function 0 [1022:1600]
00:18.1 Host bridge [0600]: Advanced Micro Devices [AMD] Family 15h Processor Function 1 [1022:1601]
00:18.2 Host bridge [0600]: Advanced Micro Devices [AMD] Family 15h Processor Function 2 [1022:1602]
00:18.3 Host bridge [0600]: Advanced Micro Devices [AMD] Family 15h Processor Function 3 [1022:1603]
00:18.4 Host bridge [0600]: Advanced Micro Devices [AMD] Family 15h Processor Function 4 [1022:1604]
00:18.5 Host bridge [0600]: Advanced Micro Devices [AMD] Family 15h Processor Function 5 [1022:1605]
01:05.0 VGA compatible controller [0300]: ATI Technologies Inc 760G [Radeon 3000] [1002:9616]
01:05.1 Audio device [0403]: ATI Technologies Inc RS780 Azalia controller [1002:960f]
02:00.0 Network controller [0280]: Ralink corp. RT2860 [1814:0781]
03:00.0 USB Controller [0c03]: Device [1b21:1042]
04:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Et
hernet controller [10ec:8168] (rev 06)
== END lspci -nn ==
== BEGIN lsusb ==
Bus 007 Device 001: ID 0000:0000
Bus 002 Device 002: ID 058f:6362 Alcor Micro Corp. Flash Card Reader/Writer
Bus 002 Device 001: ID 0000:0000
Bus 003 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000
Bus 006 Device 001: ID 0000:0000
Bus 004 Device 001: ID 0000:0000
Bus 004 Device 003: ID 0461:0010 Primax Electronics, Ltd
Bus 004 Device 002: ID 0461:4de2 Primax Electronics, Ltd
Bus 005 Device 001: ID 0000:0000
== END lsusb ==
== BEGIN rpm -qa kmod\* kmdl\* ==
kmod-gfs-xen-0.1.34-15.el5.centos
kmod-gfs-0.1.34-15.el5.centos
kmod-gnbd-0.1.5-2.el5.centos
kmod-gnbd-xen-0.1.5-2.el5.centos
== END rpm -qa kmod\* kmdl\* ==
== BEGIN ifconfig -a ==
eth0 Link encap:Ethernet HWaddr 54:04:A6:8A:28:D3
inet addr:192.168.1.106 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::5604:a6ff:fe8a:28d3/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:34026 errors:0 dropped:0 overruns:0 frame:0
TX packets:24919 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:30745010 (29.3 MiB) TX bytes:3928933 (3.7 MiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:664 errors:0 dropped:0 overruns:0 frame:0
TX packets:664 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:59764 (58.3 KiB) TX bytes:59764 (58.3 KiB)
peth0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:37550 errors:0 dropped:37550 overruns:0 frame:37550
TX packets:28044 errors:0 dropped:106 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:32633594 (31.1 MiB) TX bytes:4279360 (4.0 MiB)
Interrupt:252 Base address:0x8000
sit0 Link encap:IPv6-in-IPv4
NOARP MTU:1480 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
veth1 Link encap:Ethernet HWaddr 00:00:00:00:00:00
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
veth2 Link encap:Ethernet HWaddr 00:00:00:00:00:00
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
veth3 Link encap:Ethernet HWaddr 00:00:00:00:00:00
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
vif0.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:28061 errors:0 dropped:0 overruns:0 frame:0
TX packets:37534 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4311562 (4.1 MiB) TX bytes:32632080 (31.1 MiB)
vif0.1 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
vif0.2 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
vif0.3 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
virbr0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:29 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:6767 (6.6 KiB)
xenbr0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:9034 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1902062 (1.8 MiB) TX bytes:0 (0.0 b)
== END ifconfig -a ==
== BEGIN brctl show ==
bridge name bridge id STP enabled interfaces
virbr0 8000.000000000000 yes
xenbr0 8000.feffffffffff no vif0.0
peth0
== END brctl show ==
== BEGIN route -n ==
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
== END route -n ==
== BEGIN cat /etc/resolv.conf ==
; generated by /sbin/dhclient-script
search ed.shawcable.net
nameserver 64.59.184.13
nameserver 64.59.184.15
== END cat /etc/resolv.conf ==
== BEGIN grep net /etc/nsswitch.conf ==
#networks: nisplus [NOTFOUND=return] files
#netmasks: nisplus [NOTFOUND=return] files
netmasks: files
networks: files
netgroup: nisplus
== END grep net /etc/nsswitch.conf ==
== BEGIN chkconfig --list | grep -Ei 'network|wpa' ==
NetworkManager 0:off 1:off 2:off 3:off 4:off 5:off 6:off
network 0:off 1:off 2:on 3:on 4:on 5:on 6:off
wpa_supplicant 0:off 1:off 2:off 3:off 4:off 5:off 6:off
== END chkconfig --list | grep -Ei 'network|wpa' ==
This Post was from: https://www.centos.org/newbb/viewtopic.php?forum=40&topic_id=35877&post_id=155206