Networking :: Strange Martian Behavior When Using Switch Vs Hub?

May 21, 2010

I have an old PC running an older version of linux with two network cards serving as my firewall router. The network cards are netgear 310tx cards. Noticed traffic was not getting routed at times. Figured my switch was going bad, so I hooked up an old hub to keep keys systems communicating while I get a new switch. No problems with hub, but only has 5 ports.

Get new switch (different make/model from old one), install, a couple of my systems have connectivity problems, but others do not. Thinking it was a bad switch, returned it, got a new one just like my old one (which I thought was going bad, but worked for several years). Hook it up, paying attention to my firewall console and notice martian header messages. Network traffic not getting routed at all. The interface for connected to LAN was slow to get started (my firewall can communicate to the Internet, but LAN communication was hosed).

System would "hang" spitting out martian header messages until I disconnected LAN cable. Thinking network card may be bad, replaced it with another version of the same type. Same problems: martian header messages and traffic not getting routed.

HOWEVER, if I remove the switch and use my old hub, no problems. Networking appears to work for all systems connected to hub. Since I and my wife work from home, I'm using the hub right now (with non-essential systems not connected due to limited ports). I can only do any real experimentation at night.

I have no idea why things would work differently between using a hub vs a switch. Could something have gone awry with the linux kernel (2.4.20-46.7)?

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Ubuntu Networking :: Strange Behavior With Pings From Desktop?

Mar 9, 2011

I've been trying to use MySQL in Ubuntu but I've been having some connection issues and in trying to troubleshoot that, I observed this strange behavior with pings in Ubuntu Desktops inside our network.

- All Ubuntu Servers we have (10.10 and 8.04) behave as expected
- All Windows machines behave as expected
- All 5 Ubuntu Desktops we have, (10.10 and 9.10) exhibit the following unexpected behavior:

If they have a local ip addresses and are connected within the internal network, either to a switch or directly to a router, pings take much longer to be sent. It's not a higher lag, it's the time between each ping that increases. I have to wait for around 5 seconds for each ping, but the time in the ping reply is less than 100ms, also they're all in order so I assume it's the system delaying the sending of each ping.

If I plug a USB 3G modem directly then it works as expected again (~1 sec between each ping sent). Is this an intended feature, that depends on the network environment, or is this something I should look into more closely?

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Networking :: Can Ping But Can't Wget / Strange Network Behavior

Apr 28, 2011

I have a small ARM machine running an Arch linux variant, PlugApps. It was set up and working fine at my home, with a standard networking setup -- cable modem and router. I could do pretty much anything I needed to access the net fine.This machine is a remote monitoring system for another location. I shipped it to that location and am now trying to get it set up using another set of hands on site. There it is on the network behind a dsl modem and a router. I forwarded ports from the dsl modem to the router and from the router to the ARM computer.

In both cases the ARM machine is/was configured to use dhcp.So here's the deal:I can ssh into the ARM machine just fine.I can ping hosts on the wan fine (eg: stanford.edu).BUT:wget fails for not being able to resolve a valid address (eg: http://checkip.dyndns.org)the PlugApps package management system (pacman) cannot resolve the repository address the openntp time sync isn't working On the new network, I am able to connect to another client windows PC which has the same associated network info (Bcast address, Mask, etc. - comparing windows "ipconfig" vs linux "ifconfig" outputs) but which can resolve addresses for web browsing, etc.What am I missing? If it can resolve addresses for pings, why can't it work for other address requests? If I can ssh interact with it, why can't it connect to the net for other purposes?

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OpenSUSE Wireless :: Strange WiFi Behavior Breaks Connection Repeatedly

May 30, 2011

I have recently upgraded to 11.4 and also had to renew an AP (HP ProCurve 10ag). This was several years old but replaced an identical model which had been working well until recently. I thought it would be appropriate to flash newer firmware as the device four releases behind the times. The access point serves partner's XP laptop and my openSUSE 11.4 laptop and after flashing the firmware both machines would make a connection and then break and remake, to the extent that the openSUSE machine became unusable. I thought it was an encryption problem and spent hours changing the AP and Client setups to no avail

After reading a thread here I checked out dmesg and this is what I found:-
[78.639247] wlan0: authenticate with 00:1d:b3:4b:ae:14 (try 1)
[78.640804] wlan0: authenticated
[78.642507] wlan0: associate with 00:1d:b3:4b:ae:14 (try 1)
[78.651195] wlan0: RX AssocResp from 00:1d:b3:4b:ae:14 (capab=0x411 status=0 aid=1)
[78.651200] wlan0: associated
[78.652222] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[78.652283] cfg80211: Calling CRDA for country: DE
[78.674378] cfg80211: Regulatory domain changed to country: DE .....
This went on and on.

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Networking :: Martian Source Errors Between Networks?

May 20, 2011

Some time ago mine logs start to show this message

Apr 23 11:03:01 xxxxx kernel: [38048596.800691] martian source 192.168.0.87 from 217.15.41.137, on dev eth1
Apr 23 11:03:01 xxxxx kernel: [38048596.800691] martian source 192.168.0.87 from 217.15.41.137, on dev eth1
Apr 23 11:15:02 xxxxx kernel: [38049523.750307] martian source 192.168.0.87 from 217.15.41.137, on dev eth1

[code]...

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OpenSUSE Network :: Martian Source From Unconfigured Interface?

Mar 24, 2010

There is a cable plugged in to the second network card, but that interface is not configured. I'm getting a lotof "martian source" alerts because of this.If the interface eth1 isn't started because it isn't configured, why am I getting these messages?

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Ubuntu Networking :: Different DHCP Behavior In Server Versus Desktop

Jan 20, 2010

I've noticed something strange in the behavior of how Ubuntu server obtains it's IP address versus Ubuntu desktop and other versions of linux and Windows. When Ubuntu desktop obtains an IP address from my router that address is retained from one bootup to the next, same behavior as Windows, SuSE, and pretty much any other OS. Ubuntu server on the other hand grabs a different IP address everytime it boots. At first I guessed it was a difference in /etc/dhcp3/dhclient.conf so I replaced it with the dhclient.conf from Ubuntu desktop but no dice, it still grabs a new address every time.

In /etc/network/interfaces Ubuntu server defines the loopback interface and primary network interface, just as it should but Ubuntu desktop does not define the network interface, only the loopback interface. I'm guessing something else controls does this. Desktop appears to be storing previous IP lease information in /var/lib/dhcp3/dhclient.eth0.leases but server doesn't, /var/lib/dhcp3/dhclient.leases is always empty and there's no other files in /var/lib/dhcp3/.

Apparently something isn't writing old lease info there. Without setting a static IP address, how can Ubuntu server be configured to retain the same IP address between boots like Ubuntu desktop?I'm using Ubuntu server 8.04LTS, Ubuntu desktop 9.10 & 9.04, SuSE 11.0, Linux Mint, Windows XP, pfSense 1.2.2 as router.

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Apr 23, 2011

At my grandparents house, there is a Wi-Fi network that we can (sometimes) connect to. However, it lately hasn't been allowing our Win 7 laptops to connect. It does let my Wii and my iPod Touch connect with no problems. I've tried restarting, but that doesn't work. We don't have access to the router, so we can't reset that. I would really like this fixed since mobile Safari is not the best browser in the world and WiiNet is even worse..

Note: Neither of the laptops are mine (one is my sister's and one is my parents'). I would never allow a computer of mine to use such an operating system.

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Dec 22, 2010

I'm getting these strange answers from opera when I ask it what speed for download does it have. I am downloading fedora using ubuntu right now. Why opera tells me it's downloading with almost 200kb/s while the system monitor from ubuntu can't pass more than 110kb/s ...

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Jul 26, 2011

I am noticing the following output when running ifconfig:

[root@proxy log]# ifconfig -a
dev32758 Link encap:Ethernet HWaddr 00:xx:xx:xx:xx:xx
BROADCAST MULTICAST MTU:1500 Metric:1

[code]....

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Nov 2, 2010

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I managed to connect without any problem and I am not being periodically disconnected (which seems to be a frequent problem) but when I enter an address in firefox or click a link there is a 20-40 second delay before it will take me to the page, but once I am on the page if I click another link it will take me there straight away (as long as I am in the same tab, if I switch to a different window I have the 30 second delay again). Same with downloading files, when I click a download link it takes about half a minute to register that I have clicked, but once it establishes the connection my speeds are the same as they always are. speedtest.net is showing 8mbps, and the last file I downloaded came through at 900kbps once the connection established. It is very irritating since other than that I am loving Ubuntu and the more I read about Linux the more I want to drop my windows 7 altogether (running dual boot just now).

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Ubuntu Networking :: PC Giving Strange Results When Being Pinged

May 27, 2011

Right then... all DHCP
PEGASUS 192.168.0.101
When being pinged from another PC aok, but also pings back on 192.168.0.100? When being pinged from itself using ping 192.168.0.101 (or 100) all is well - when pinged as ping PEGASUS is says following:

64 bytes from localhost.localdomain (127.0.0.1): icmp_req=1 ttl=64 time=0.033 ms
64 bytes from localhost.localdomain (127.0.0.1): icmp_req=2 ttl=64 time=0.044 ms
64 bytes from localhost.localdomain (127.0.0.1): icmp_req=3 ttl=64 time=0.042 ms
64 bytes from localhost.localdomain (127.0.0.1): icmp_req=4 ttl=64 time=0.040 ms
^C64 bytes from localhost.localdomain (127.0.0.1): icmp_req=5 ttl=64 time=0.042 ms

The IP says its 127.0.0.1 (home) WTF is going on>. Why has PEGASUS been assigned 2 ips, and when pinging using HOSTNAME why does it point to home?

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Networking :: Dropping Internet Connection / Strange IP Addresses?

Oct 17, 2010

I usually start up my Internet service by typing ./rc.inet1. While its connecting I usually see my routers ip address then I connect and I start browsing and everything is fine. A few times I noticed that instead of seeing the routers address it showed some other address and I could not get online. I try ./rc.inet1 stop and renew but still cannot connect, I reboot and I then see the router and I can connect. I am using slackware13, and opera10 browser.

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Jan 25, 2011

I opened a thread on the general networking section of the forums to discuss about a problem I am experiencing with a newly installed slackware 13.1 (not 64b) on my dell laptop. Basically, the machine is not getting an IP from the dhcp server on my pfsense router. All other machines on my network are still getting IP's fine, and the pfsense box never changed. I can get an IP from the pfsense box by manually loging as root and using /etc/rc.d/rc.inet1 eth0 restart (note the argument eth0 necessary to get the ip).

User markush at the link below suggested I open this thread here, I think its a great idea since I believe it is a slackware problem. he also recommended to use tcpdump to diagnose the connection problem. Here's the results:

I issued the dhcp renewal commands in a terminal and monitored the output of tcpdump in a different terminal.

Code:
root@xpsm1730:/home/lpallard# /etc/rc.d/rc.inet1 restart
Polling for DHCP server on interface eth0:
dhcpcd: version 5.2.2 starting
dhcpcd: eth0: waiting for carrier
dhcpcd: timed out

[Code]....

I believe the router is fine since all other machines are all using slackware 13.1 (one slackware 32bit and the other slackeware 64) and are all handshaking perfectly with the pfsense box.

I also believe the kernel on the faulty machine is OK since I am using the very same kernel(2.6.37) on the machine running slack64 and this machine is also handshaking perfectly with my pfsense box.

Please see http://www.linuxquestions.org/questi...get-ip-857683/ for more details.

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Oct 11, 2010

Nothing worse than finding old docs:[URL]I would like to redirect "martian source"I have added:

Code:
filter f_martian { facility(kern) and match('^martian source'); };
filter f_console { level(warn) and facility(kern) and not filter(f_iptables)

[code]....

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Ubuntu Networking :: Added Some Loopback Ip's And Strange Behaviour Ensues?

Feb 7, 2010

I added the following lines to my /etc/rc.local file:

Code:
ifconfig lo:0 10.10.10.1 netmask 255.255.255.0
ifconfig lo:1 10.10.10.2 netmask 255.255.255.0

[code]....

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Dec 12, 2010

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Jul 28, 2009

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Oct 7, 2010

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Oct 6, 2010

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Someone plugs into Port 2 and gives themself the same address.

That would cause problems, right?

So, is there a way, to say to the switch, "Hey, 10.3.2.1 is on Port 1, and nowhere else. Do not let anyone use the IP 10.3.2.1 on any other port, and if they do, disallow the traffic."

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May 10, 2010

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I could just switch the cables over but this should be doable in software and I'd like to know how.

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Nov 5, 2010

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Jun 30, 2010

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Jan 15, 2011

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Feb 15, 2011

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May 10, 2010

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Nov 29, 2010

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May 4, 2011

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Nov 24, 2009

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Nov 9, 2010

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