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I hate to do this Jay, but the formula does not work here...<BR>
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On Tue, 2007-04-17 at 15:03 -0400, Jay Nugent wrote:
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<FONT COLOR="#000000">Greetings Skip (et al),</FONT>
<FONT COLOR="#000000">On Tue, 17 Apr 2007, (Skip) K8RRA wrote:</FONT>
<FONT COLOR="#000000">> On Tue, 2007-04-17 at 12:08 -0500, Barry Siegfried wrote:</FONT>
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<FONT COLOR="#000000"> Nada. No way. Uh uh. No sirie! NAT, cough gag hurl!</FONT>
<FONT COLOR="#000000"> The "source" address of an outgoing packet is determined by the</FONT>
<FONT COLOR="#000000">*interface* address used. And which *interface* is determined by the</FONT>
<FONT COLOR="#000000">destination address you are trying to reach, and what *interface* the</FONT>
<FONT COLOR="#000000">*route table* says you must use to get to the desired destination.</FONT>
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The above protocol did not work here - the FROM IP remained 192... as seen in the tun0 trace.<BR>
I used ping 44.102.132.20 (me) and 44.102.132.1 (Dave)<BR>
In all cases the ICMP packet from ping did go out the radio as it should - OUTBOUND is OK... except for FROM IP.<BR>
The route table is attached for your inspection.
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<FONT COLOR="#000000"> That's alot to chew on. Let me explain...</FONT>
<FONT COLOR="#000000"> I have a Linux box here. It's address is 216.144.208</FONT>.6.
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I have a Linux box here with FC-6 and jnos on it. The host is static 192.168.1.32
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<FONT COLOR="#000000"> However, I </FONT>
<FONT COLOR="#000000">would like this box to also be able to reach the HTTP webpages at </FONT>
<FONT COLOR="#000000">wb8rcr.ampr.org. To do this I added an additional *interface* to this box </FONT>
<FONT COLOR="#000000">along with the supporting *route* entry, as follows:</FONT>
<FONT COLOR="#000000"> ifconfig eth0:44 44.102.1.239</FONT>
<FONT COLOR="#000000"> route add -net 44.0.0.0/8 gw 44.102.1</FONT>.1
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My choices were both:<BR>
<BR>
ifconfig eth0:44 44.102.132.229<BR>
route add -net 44.102.0.0/16 tun0<BR>
<BR>
and:<BR>
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ifconfig tun0:44 44.102.132.229<BR>
route add -net 44.102.0.0/16 tun0<BR>
<BR>
In both cases the ifconfig showed the desired added interface - I don't have yours for comparison but they look OK to me.<BR>
<BR>
Interesting fact (FYI):<BR>
In the first case "eth0:44" the ifconfig statement added a route to the host table "44.0.0.0 * ... eth0"<BR>
In the second case "tun0:44" there was no route added to the table automatically.
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<FONT COLOR="#000000"> So at this point I now have a Linux box that will send ALL it's traffic</FONT>
<FONT COLOR="#000000">out onto my ethernet as 216.144.208.6 *UNLESS* it happens to be going to</FONT>
<FONT COLOR="#000000">anything in the AMPRnet (44/8). In which case it flows out onto my</FONT>
<FONT COLOR="#000000">ethernet addressesd FROM 44.102.1.239 and GATEWAYED through 44.102.1.1</FONT>
<FONT COLOR="#000000">(which happens to be my JNOS/Hamgate on that very same ethernet).</FONT>
<FONT COLOR="#000000"> Now, remember what I said about "Think like a Packet" the other day. </FONT>
<FONT COLOR="#000000">What's missing? ...a return route!!!</FONT>
<FONT COLOR="#000000"> So on the JNOS/Hamgate I have to add a route that will send any packets</FONT>
<FONT COLOR="#000000">it receives *for* 44.102.1.239 *back* to the Linux box on the ethernet. </FONT>
<FONT COLOR="#000000">So on the JNOS/Hamgate I have added this route:</FONT>
<FONT COLOR="#000000"> route add 44.102.1.239 et</FONT>h0
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this was:<BR>
route add 44.102.132.229 tun0<BR>
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The route tables partly worked - the packet went out.
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<FONT COLOR="#000000"> BINGO!!!</FONT>
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NO BINGO!!! Lost packets for wrong FROM IP (I guess).<BR>
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<FONT COLOR="#000000"> Skip, I believe you will be attending this Saturday's DRG meeting? In</FONT>
<FONT COLOR="#000000">my training session I'll be going over static routing and how to "Think</FONT>
<FONT COLOR="#000000">like a Packet". Hope to see you there! And hope that we can help clear</FONT>
<FONT COLOR="#000000">up any misconceptions and help lift the fog a little. I'll bring an empty</FONT>
<FONT COLOR="#000000">V8 juice can with me so you can smack it into your forehead when this all</FONT>
<FONT COLOR="#000000">comes clear for you ;-) See you there</FONT>!
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I expect you will see me - but I'd like to be successful before I arrive at the meeting.<BR>
<BR>
What say you?
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<FONT COLOR="#000000"> --- Jay Nugent WB8TKL</FONT>
<FONT COLOR="#000000"> </FONT>
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73<BR>
de [George (Skip) VerDuin] K8RRA k
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