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  1. #16
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    Re: CentOS and Evolution

    Try typing the following in the command line.

    route

    BTW smtp relay errors having nothing to do POP or IMAP, smtp is the mail transport ( Used for sending mail for clients. ) and POP/IMAP are mail storage servers.

  2. #17
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    Re: CentOS and Evolution

    Did that already, I will have to post the actual results on Monday. Here is what I remember the route command giving me.....
    Kernel IP routing table
    Destination Gateway Genmask Flags Metric Ref Use Iface
    192.168.50.0 * 255.255.255.0 U 0 0 0 eth0
    169.254.0.0 * 255.255.0.0 U 0 0 0 eth0
    default Chester 0.0.0.0 UG 0 0 0 eth0

    I have Chester defined in the Hosts section of the network configuration GUI. I am assuming that the subnet mask of 0.0.0.0 matches any network mask, as does an IP of 0.0.0.0? Is this a bad assumption?

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  3. #18
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    Re: CentOS and Evolution

    Quote Originally Posted by Woody1&2
    Still no go. I have tried pinging known IP addresses, and it comes up with the same, "Network unreachable". I thought maybe it was due to something in the NT gateway, not allowing it to get out. I tried pining the NIC that is exposed to the internet, and much to my surprise, I got a response. So I can get outside our little world, just not far yet. Of course pinging a domain name still gives me the result that it can't find that server. There has to be something simple I am missing.
    Does the Windows proxy server require authentication? I'm just wondering if it's an authentication issue on the Windows proxy server.

    Maybe something in this thread for you:

    http://www.fedoraforum.org/forum/sho...=&threadid=742

  4. #19
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    Re: CentOS and Evolution

    Quote Originally Posted by Woody1&2
    Did that already, I will have to post the actual results on Monday. Here is what I remember the route command giving me.....
    Kernel IP routing table
    Destination Gateway Genmask Flags Metric Ref Use Iface
    192.168.50.0 * 255.255.255.0 U 0 0 0 eth0
    169.254.0.0 * 255.255.0.0 U 0 0 0 eth0
    default Chester 0.0.0.0 UG 0 0 0 eth0

    I have Chester defined in the Hosts section of the network configuration GUI. I am assuming that the subnet mask of 0.0.0.0 matches any network mask, as does an IP of 0.0.0.0? Is this a bad assumption?
    Here's my question, what is Chester? As when I do a route command with nothing defined in the hosts secton of the G.U.I for network, the third line reads the same as yours except the dns name of my router appears where "Chester" appears in your line.
    I think you have some network configuration issue, if I'm understanding the output of route correctly Destination should be a network number for example 192.168.50.0 then the gateway used to reach that specific network, but your default entry should be the one the PC is using to reach any networks other than the specific ones defined - i.e. the internet.

  5. #20
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    Re: CentOS and Evolution

    Ned, The proxy server does not require authentication.

    Jackal, Chester is the gateway machine, which gets us to the outside world. It acts as a proxy server as well, so that we can track the goings on of our employees as far as web sites visited. I did a route add default 192.168.50.10, which is the address of CHester. When I did that, I had the above entries, plus this line:

    Destination Gateway Genmask Flags Metric Ref Use Iface
    default 192.168.50.10 255.255.255.0 UG 0 0 0 eth0

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  6. #21
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    Re: CentOS and Evolution

    I'm no routing expert but 192.168.50.10, would be included in Class C Network 192.168.50.0, so you wouldn't need a separate entry to reach it, your 1st entry of 192.168.50.0 using * (or none) for a gateway or router, using eth0 as the connection device should get you there (to chester, that is), then chester would handle the outgoing to the world.

    So my guess would be your network configuration should be.

    IP address - 192.168.50.X
    Subnet Mask - /24
    Gateway - 192.168.50.10

    No other entries should be needed, as long as chester is routing traffic to your DNS servers for you, if it's not, then you may need to add thier IP addresses as well, on the DNS servers page of the G.U.I config. Outside of that, I'd remove any of the other stuff you had done, as it "should" be that simple, you shouldn't need any hosts file entries, or anything like that.

    Again, I'm no expert.
    Last edited by Jackal; 07-08-2006 at 08:26 PM.

  7. #22
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    Re: CentOS and Evolution

    I will give that a try Jackal. I am about at my wit's end with it.

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  8. #23
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    Re: CentOS and Evolution

    reading back I see that you use both static and dhcp addresses, make sure you're not duplicating a DHCP address with a static one, and make sure your proxy server is set to allow all traffic through for the IP address assigned to your Linux box.

  9. #24
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    Re: CentOS and Evolution

    I have tried it both ways. When I had Windows 2000 installed on the system, I had the same IP address set statically. I tried DHCP just to check and see if that was an issue....

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  10. #25
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    Re: CentOS and Evolution

    I keep going back to your first post and...

    Quote Originally Posted by Woody1&2
    I can browse the internet fine, so I have connectivity.
    this tells me it's not a basic tcp/ip configuration issue.

  11. #26
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    Re: CentOS and Evolution

    I agree with that, Ned, just noting basic networking fundamentals in that he's got extra entries that he doesn't need, that may be muddying the waters.

    Simply stated 192.168.50.0 /24 is a single Broadcast Domain, and no hosts within it should be separated by a router, else it wouldn't work at all, and that any entries in a Hosts file would cause the box to look there for resolution before DNS servers, however, since he's getting "network unreachable" when attempting a dig (UDP port 53) or email (SMTP Port 25), so it appears as traffic destined for any ports other than 80 are being blocked, most likely by his proxy server.
    Last edited by Jackal; 07-09-2006 at 09:25 AM.

  12. #27
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    Re: CentOS and Evolution

    Okay, I set everything back in the GUI network settings back to what it was when I first set it up (default), set my network card to receive DNS and an IP via DHCP. I did a route command to see the routing table, and it showed everything here, less the GW....

    [root@localhost dougw]# /sbin/route
    Kernel IP routing table
    Destination Gateway Genmask Flags Metric Ref Use Iface
    192.168.50.0 * 255.255.255.0 U 0 0 0 eth0
    169.254.0.0 * 255.255.0.0 U 0 0 0 lo
    default 192.168.50.10 0.0.0.0 UG 0 0 0 eth0

    So, I added the gateway entry you see by doign a "route add default gw 192.168.50.10"

    One thing I do not notice, is an entry for the loopback for local host. I try pinging local host though, and that still works okay.

    Still no go. I Have also re-started the network service after every step I took, just to make sure I wasn't missing it.... What am I missing?

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  13. #28
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    Re: CentOS and Evolution

    Network settings still look absolutely fine (and prersumably a working browser connection confirms that). To answer an earlier question about whether your proxy server allows mail relay, does it work on a windows box with, say, thunderbird?

    Quote Originally Posted by Jackal
    In TBird, did you go to Edit-->Preferences-->advanced-->connection settings-->Manual Proxy configuration-->HTTP Proxy Port 80?
    When you set this, did you try both IP address and domain name entries. Also, it probably needs to be prefixed with http:// even when using the IP. So, it would look like:

    http://192.168.0.10 Port:80

    Quote Originally Posted by Woody1&2
    I set the IP by actual IP number address, not with the domain name. That doesn't work. I figured possibly it was due to SELinux or firewall. No difference after disabling both.

    Carlwill: I am trying to get out to a POP server. How do I check to see if SMTP relay is forbidden?

    I do have access to that serverusing the internet (WebMail) that we have set up.

    When I try to send/receive, I get the error, No route to host.

    When trying to do a traceroute from the command line, it gives me the same answer, no route to host.

    From what I see, it possibly is not recognizing that it has to go through our gateway (which is actually our proxy server). The internet gets out since I set the web browser to go through it. Whereas everything else system-wide does not see that it has to go through that gateway.
    Maybe you can export the http proxy settings as an environment variable so that command line stuff should then work. So, for example, if stuff like ping doesn't work, try:

    Code:
    $ export http_proxy=http://proxy.foo.com:80/
    $ ping 66.102.9.147  <-- that's google.com
    ^^ you'd need to add it to your shell profile to retain the setting.

  14. #29
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    Re: CentOS and Evolution

    Thunderbird was my email client when I was using Windows 2000, and that worked fine.
    Settings are identical to what I had when I ran Windows. I never had to set any proxy for mail when using Windows, so I didn't do that initially, only after I was having the issues connecting....

    I tried exporting the proxy as you suggested; Here is the output:

    [root@localhost dougw]# /sbin/route
    Kernel IP routing table
    Destination Gateway Genmask Flags Metric Ref Use Iface
    192.168.50.0 * 255.255.255.0 U 0 0 0 eth0
    169.254.0.0 * 255.255.0.0 U 0 0 0 lo
    default 192.168.50.10 0.0.0.0 UG 0 0 0 eth0
    [root@localhost dougw]# export http_proxy=http://192.168.50.10:80/
    [root@localhost dougw]# ping 66.102.9.147
    PING 66.102.9.147 (66.102.9.147) 56(84) bytes of data.

    --- 66.102.9.147 ping statistics ---
    308 packets transmitted, 0 received, 100% packet loss, time 307021ms

    [root@localhost dougw]#


    As you can see, I had to interupt the ping request with ^C because it sat there for several minutes without any output.

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  15. #30
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    Re: CentOS and Evolution

    I must admit I'm running thin on suggestions, as NED stated, and I too, it "should" work fine, I would suggest checking to make sure you have your eth0 set as a trusted device in the security level G.U.I, you will most likely see a sit0 in there as well, if it's not marked as trusted, go ahead and mark it, for grins you can check the settings for mail (smtp), and add 53:udp under other ports, neither of these settings "should" stop you from receiving mail, they are more for using your system as a DNS and SMTP server, however, just to make sure...

    one other suggestion just for simplicity sake, I'm running smtp server and http, on the same box, see if you can hit my website via telnet www.comm-net.net 80 (you won't be able to do much that way except connect, then ctrl + ] to quit, if that is successful, see if you can telnet www.comm-net.net 25, if neither of those work, but you can successfully use a browser to go to the url http://www.comm-net.net - my guess is there is something blocking traffic other than http from or to your MAC address, perhaps an access list somewhere? If ANY of those 3 things work, then DNS is obviously working as you wouldn't be able to resolve www.comm-net.net to it's public IP address.

    Did you say that you used that exact same NIC running windows and it worked fine?

    You're not going through an IP telephone, through a cisco switch with port security enabled, and have potentially plugged that NIC in some other port?

    These are pretty obscure possibilities, but possibilities nonetheless.
    Last edited by Jackal; 07-11-2006 at 03:08 AM.

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