( Odd Behavior ) - When my Internet connection first comes up, nothing works. If I try again, everything then works fine. Why is this?

Linux IP Masquerade HOWTO
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# 7.14. ( Odd Behavior ) - When my Internet connection first comes up, nothing works. If I try again, everything then works fine. Why is this?

The reason is because you have a dynamic IP address and when your Internet connection first comes up, IP Masquerade doesn't know its IP address. There is a solution to this. In your /etc/rc.d/rc.firewall-* ruleset, add the following:

    # Dynamic IP users:
    #
    #   If you get your IP address dynamically from SLIP, PPP, or DHCP, enable this
    #   following option.  This enables dynamic-ip address hacking in IP MASQ, making
    #   the life with Diald and similar programs much easier.
    #
    echo "1" > /proc/sys/net/ipv4/ip_dynaddr

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