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FC6 networking problem, a clue at last
by Eur Ing Chris Green 16 Mar '07

16 Mar '07

I'm investigating my FC6 to home problem and it looks as if my router may be blocking some of the traffic, trouble is I don't know what the message means. The router log is saying:- FIREWALL fast tcp seqnr check (1 of 2): Protocol: TCP Src ip: 192.168.1.1 Src port: 22 Dst ip: 193.128.168.194 Dst port: 51097 Does anyone have a clue what that indicates? The destination is certainly the work system (193.128.168.194). -- Chris Green

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Anyone have a web site behind a NAT router I can try?
by Eur Ing Chris Green 15 Mar '07

15 Mar '07

Does anyone here have a web site behind a NAT router that I can try accessing from my problem FC6 box please. Then I would have a bit more evidence that the problem is something to do with the router (and/or NAT). -- Chris Green

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Networking (across the internet) problem
by Eur Ing Chris Green 15 Mar '07

15 Mar '07

My FC6 at work to Slackware 11 at home problem continues. It originally seemed to be just an SSH problem but I think it's more than that, I can't see web pages on the apache sesrver on my home machine either. Since the only two 'holes' in the firewall at home are for ssh and http I can't really try anything else. The symptom seems to be that just about nothing (in the way of data) gets from my home machine to the FC6 machine at work. Working from other machines at work (Solaris and other Linux distributions) everything works fine. Similarly the FC6 machine at work seems to communicate with the rest of the world without problems. There is one set of messages about a similar problem that I have found on Google which suggests it may be an MTU size problem. I have tried setting the MTU at both ends to 576 but I'm not convinced I've done this right. If I just do:- ifconfig eth0 mtu 576 at both ends is that all that's needed? Does the change take effect immediately or what? The *only* thing I can think of that's really different when talking (or not) to my home system is that it's through a NAT router and this is what, maybe, points at the MTU issue. Though I really don't understand why it only happens from the FC6 systems. -- Chris Green

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rlogin hangs soemtimes
by Eur Ing Chris Green 15 Mar '07

15 Mar '07

I have just moved to Fedora Core 6 on my desktop computer at work. We have a mixed environment of Windows PCs a few Linux ones and a number of Solaris target systems. When I rlogin from my new FC6 system to the Solaris systems the login sometimes just hangs, i.e. I type "rlogin crusade" and nothing happens for several minutes then I get a timeout message. This seems to happen only on the FC6 systems, I have tried it from one other FC6 system and it's the same but from a kubuntu installation (on the same sub-net) it doesn't happen. The rlogin hangs maybe one time in four or so, the other times it connects normally and works OK from then on. Does anyone have any ideas what might be causing this problem? -- Chris Green

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Another question re networking and Fedora
by Eur Ing Chris Green 14 Mar '07

14 Mar '07

The sysop here bodged the /etc/hosts file so that 'hostname' worked sort of correctly, now I've removed the bodge 'hostname' doesn't work right any more. At home (Slackware) I get:- home$ hostname -s home home$ hostname home home$ hostname -f home home$ domainname (none) Here on this Fedora box I get:- $ hostname chrisg.localdomain $ hostname -s hostname: Unknown host $ hostname chrisg.localdomain $ hostname -f hostname: Unknown host $ domainname GEMS -- Chris Green

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Really strange networking/DNS/internet problem
by Eur Ing Chris Green 14 Mar '07

14 Mar '07

I seem to have some very odd networking issues from this new Fedora 6 box at work. The symptoms I have dug out so far are:- There's an odd mix of places that it fails to find with 'dig' and/or 'host'. E.g.:- chrisg$ host enta.net ;; connection timed out; no servers could be reached chrisg$ but:- chrisg$ host gradwell.net gradwell.net has address 193.111.200.100 gradwell.net mail is handled by 10 mail-in-2.lb.gradwell.net. gradwell.net mail is handled by 10 mail-in-1.lb.gradwell.net. ("host enta.net" works fine from other places, e.g. from my account om gradwell.net and one at cheddar.halon.org.uk) Similarly "ssh home.isbd.net" just hangs and eventually times out, but ssh to lots of other places works fine. "ssh home.isbd.net" works from other systems here (including another Linux box). Finally although "host enta.net" times out a traceroute to enta.net works OK:- traceroute to enta.net (195.74.96.162), 30 hops max, 40 byte packets 1 193.128.168.254 (193.128.168.254) 25.350 ms 26.522 ms 29.265 ms 2 Loopback0.GW3.CBG3.ALTER.net (158.43.136.5) 5.538 ms 5.945 ms 7.089 ms 3 POS3-2.CR2.CBG3.ALTER.net (158.43.136.57) 7.144 ms 7.198 ms 7.727 ms 4 pos6-0.cr2.lnd6.gbb.uk.uu.net (158.43.253.146) 11.392 ms 11.784 ms 12.172 ms 5 srp1-0.br1.lnd6.gbb.uk.uu.net (158.43.194.238) 12.441 ms 12.851 ms 13.267 ms 6 ge3-0.pr1.lhr1.uk.above.net (195.66.224.76) 20.802 ms 15.856 ms 15.818 ms 7 213.161.78.218 (213.161.78.218) 10.041 ms 10.367 ms 10.698 ms 8 telehouse-web.enta.net (195.74.96.162) 10.443 ms 10.620 ms 10.958 ms I'm really lost and don't kow where to look. I had thought it was a firewall issue or an MTU issue but, as I said, ssh from another Linux box here behind the same firewall works OK. The other box has the same MTU as chrisg and is on the same subnet. -- Chris Green

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How to set runlevel permanently
by Eur Ing Chris Green 14 Mar '07

14 Mar '07

Where/how is the system's runlevel set? I know how to change the 'current' runlevel by running telinit but when you reboot the system restarts in the original default runlevel. I want always to boot into runlevel 3 rather than 6. -- Chris Green

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A Fedora/Firefox question
by Eur Ing Chris Green 14 Mar '07

14 Mar '07

Another Fedora "being too clever" annoyance! When I start Firefox it insists on going to the page:- file:///usr/share/doc/HTML/index.html The 'Home Page' in Firefox preferences doesn't override this, I have it set to about:blank. What were they thinking of to hard code this somewhere in the startup scripts! Anyway, does anyone know how to turn it off? -- Chris Green

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How to get rid of Gnome
by Peter Alcibiades 14 Mar '07

14 Mar '07

OK, then what you have to do is log on as root and do gdmsetup from a terminal. This should bring up all the gdm configuration screens. And I think that in one of these there is a controller for what options are offered at login time. You can't do su -, because then it refuses to open the display for reasons the rest of the group will immediately understand and know how to deal with....but I don't! Its something to do with specifying the screen used at launch. However, the root log on should work. Peter

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How to get rid of Gnome
by Peter Alcibiades 13 Mar '07

13 Mar '07

Sorry, what you do is just su, not invoking the root environment. You don't have to sign on as root. Then gdmsetup runs fine. At least, it does for me. And on the first screen there is a checkbox for including the configure option at logon. The thing I have found about gdm compared to xdm on old machines is that it seems a lot slower, don't know why. Peter

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