sugarwellington
October 28th, 2010, 07:17 AM
Hi, noob here. I've been having strange local network behavior with my Ubuntu 10.04 box. First off DNS was pretty flakey, but I replaced the automated DHCP servers with 8.8.8.8 and 4.4.4.4 ... that seemed to help.
Now I see very strange behavior in my local network, the symptoms of which are frequent dropped connections trying to use FTP, VNC, or Samba to try and connect to my other machines. I did a tracepath and got this back:
tracepath 192.168.1.136
1: 192.168.1.105 (192.168.1.105) 0.112ms pmtu 1500
1: no reply
2: no reply
3: no reply
3: 192.168.1.105 (192.168.1.105) 3002.961ms !H
Resume: pmtu 1500
and sometimes something like this back:
tracepath 192.168.1.136
1: 192.168.1.105 (192.168.1.105) 0.139ms pmtu 1500
1: no reply
2: 192.168.1.136 (192.168.1.136) 1.576ms reached
Resume: pmtu 1500 hops 2 back 128
tracert from one of my windows boxes makes a lot more sense and looks like this:
Tracing route to 192.168.1.136 over a maximum of 30 hops
1 <1 ms <1 ms <1 ms 192.168.1.136
Trace complete.
This problem seems like it must extend to my external network connections to as my tracepath for www.google.com (http://www.google.com) looks like this:
tracepath 192.168.1.136
1: 192.168.1.105 (192.168.1.105) 0.139ms pmtu 1500
1: no reply
2: 192.168.1.136 (192.168.1.136) 1.576ms reached
Resume: pmtu 1500 hops 2 back 128
dmcewan@yoda:~$ tracepath www.google.com (http://www.google.com)
1: 192.168.1.105 (192.168.1.105) 0.096ms pmtu 1500
1: 192.168.1.1 (192.168.1.1) 1.122ms
1: 192.168.1.1 (192.168.1.1) 1.232ms
2: c-67-188-180-1.hsd1.ca.comcast.net (67.188.180.1) 227.988ms
3: no reply
4: be-80-ar01.oakland.ca.sfba.comcast.net (68.85.154.217) 48.539ms
5: pos-0-5-0-0-cr01.sacramento.ca.ibone.comcast.net (68.86.90.137) 24.596ms
6: pos-0-7-0-0-cr01.sanjose.ca.ibone.comcast.net (68.86.85.46) 85.374ms asymm 5
7: 68.86.87.6 (68.86.87.6) 78.621ms asymm 6
8: no reply
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27: no reply
28: no reply
29: no reply
30: no reply
31: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500
Anyways, my ifconfig is below, please let me know what diagnostic info might help shed some light on this. I've already come dangerously close to destroying my system by messing with nsswitch.conf and other conf files... I need some guidance.
ifconfig
eth0 Link encap:Ethernet HWaddr 00:90:f5:a9:18:6e
UP 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:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:35 Base address:0x8000
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:19 errors:0 dropped:0 overruns:0 frame:0
TX packets:19 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4836 (4.8 KB) TX bytes:4836 (4.8 KB)
wlan0 Link encap:Ethernet HWaddr 1c:4b:d6:88:63:89
inet addr:192.168.1.105 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::1e4b:d6ff:fe88:6389/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:14261 errors:0 dropped:0 overruns:0 frame:0
TX packets:13158 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:13754933 (13.7 MB) TX bytes:2084217 (2.0 MB)
Interrupt:16 Memory:ffffc90000c68000-ffffc90000c68100
THANK YOU!
Now I see very strange behavior in my local network, the symptoms of which are frequent dropped connections trying to use FTP, VNC, or Samba to try and connect to my other machines. I did a tracepath and got this back:
tracepath 192.168.1.136
1: 192.168.1.105 (192.168.1.105) 0.112ms pmtu 1500
1: no reply
2: no reply
3: no reply
3: 192.168.1.105 (192.168.1.105) 3002.961ms !H
Resume: pmtu 1500
and sometimes something like this back:
tracepath 192.168.1.136
1: 192.168.1.105 (192.168.1.105) 0.139ms pmtu 1500
1: no reply
2: 192.168.1.136 (192.168.1.136) 1.576ms reached
Resume: pmtu 1500 hops 2 back 128
tracert from one of my windows boxes makes a lot more sense and looks like this:
Tracing route to 192.168.1.136 over a maximum of 30 hops
1 <1 ms <1 ms <1 ms 192.168.1.136
Trace complete.
This problem seems like it must extend to my external network connections to as my tracepath for www.google.com (http://www.google.com) looks like this:
tracepath 192.168.1.136
1: 192.168.1.105 (192.168.1.105) 0.139ms pmtu 1500
1: no reply
2: 192.168.1.136 (192.168.1.136) 1.576ms reached
Resume: pmtu 1500 hops 2 back 128
dmcewan@yoda:~$ tracepath www.google.com (http://www.google.com)
1: 192.168.1.105 (192.168.1.105) 0.096ms pmtu 1500
1: 192.168.1.1 (192.168.1.1) 1.122ms
1: 192.168.1.1 (192.168.1.1) 1.232ms
2: c-67-188-180-1.hsd1.ca.comcast.net (67.188.180.1) 227.988ms
3: no reply
4: be-80-ar01.oakland.ca.sfba.comcast.net (68.85.154.217) 48.539ms
5: pos-0-5-0-0-cr01.sacramento.ca.ibone.comcast.net (68.86.90.137) 24.596ms
6: pos-0-7-0-0-cr01.sanjose.ca.ibone.comcast.net (68.86.85.46) 85.374ms asymm 5
7: 68.86.87.6 (68.86.87.6) 78.621ms asymm 6
8: no reply
9: no reply
10: no reply
11: no reply
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22: no reply
23: no reply
24: no reply
25: no reply
26: no reply
27: no reply
28: no reply
29: no reply
30: no reply
31: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500
Anyways, my ifconfig is below, please let me know what diagnostic info might help shed some light on this. I've already come dangerously close to destroying my system by messing with nsswitch.conf and other conf files... I need some guidance.
ifconfig
eth0 Link encap:Ethernet HWaddr 00:90:f5:a9:18:6e
UP 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:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:35 Base address:0x8000
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:19 errors:0 dropped:0 overruns:0 frame:0
TX packets:19 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4836 (4.8 KB) TX bytes:4836 (4.8 KB)
wlan0 Link encap:Ethernet HWaddr 1c:4b:d6:88:63:89
inet addr:192.168.1.105 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::1e4b:d6ff:fe88:6389/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:14261 errors:0 dropped:0 overruns:0 frame:0
TX packets:13158 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:13754933 (13.7 MB) TX bytes:2084217 (2.0 MB)
Interrupt:16 Memory:ffffc90000c68000-ffffc90000c68100
THANK YOU!