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ip/ipconfig: fix ipnet ip= for point-to-point links (thanks k0ga)

When using ppp, the ipnet entry written should have
an ip= attribute matching our local address, not
the remote servers ip.

--- a/sys/src/cmd/ip/ipconfig/main.c

+++ b/sys/src/cmd/ip/ipconfig/main.c

@@ -555,6 +555,12 @@

 			dhcpwatch(0);

 	}

+	/*

+	 * for point-to-point links, conf.raddr wont match our local ip,

+	 * so calculate network address from our local ip before writing ndb.

+	 */

+	maskip(conf.laddr, conf.mask, conf.raddr);

+

 	/* leave everything we've learned somewhere other procs can find it */

 	putndb(1);

 	refresh();

-- 

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