Second ethernet port functionality

I was wondering if/how one can use the second ethernet port on my G5 to connect a second computer to the internet? So in other words I want to use the G5 to "pass through" to the network, and beyond. Now I have two complications (and no doubt big ones)
1) I am connected to a windows network
2) It is a windows operating system on the laptop.
(There are programs on the PC that don't run on the Apple. So I am stuck.) Any suggestions would be much appreciated.
- Roger

thank you for helps Ling Davis,
ı hope this information is clear.
ı have a problem about connection to LAN ,ı wanted to use both to ethernet ports. ı can connect with first ethernet port but second one is not available.By the way , ın network settings it's shows that both connections are available.

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    Newer Technology MAXPower 802.11n/g/b USB Adapter. The easiest way to add Wireless Connectivity to ANY computer! 2 Year Warranty.
    http://eshop.macsales.com/item/Newer%20Technology/MXP802NU2C/
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    You could try another browser.
    *MAC Address*
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    *Ethernet port hardware*
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    *Dns problem?*
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    PING google.com (64.233.167.99): 56 data bytes
    64 bytes from 64.233.167.99: icmp_seq=0 ttl=244 time=215.362 ms
    64 bytes from 64.233.167.99: icmp_seq=1 ttl=244 time=279.597 ms
    64 bytes from 64.233.167.99: icmp_seq=2 ttl=244 time=189.747 ms
    64 bytes from 64.233.167.99: icmp_seq=3 ttl=244 time=250.657 ms
    64 bytes from 64.233.167.99: icmp_seq=4 ttl=244 time=183.232 ms
    64 bytes from 64.233.167.99: icmp_seq=5 ttl=244 time=243.753 ms
    64 bytes from 64.233.167.99: icmp_seq=6 ttl=244 time=173.108 ms
    64 bytes from 64.233.167.99: icmp_seq=7 ttl=244 time=230.239 ms
    64 bytes from 64.233.167.99: icmp_seq=8 ttl=244 time=180.639 ms
    64 bytes from 64.233.167.99: icmp_seq=9 ttl=244 time=232.177 ms
    --- google.com ping statistics ---
    10 packets transmitted, 10 packets received, 0% packet loss
    round-trip min/avg/max/stddev = 173.108/217.851/279.597/33.615 ms
    If that does work, try pinging 64.233.167.99 Result:
    Ping has started ...
    PING 64.233.167.99 (64.233.167.99): 56 data bytes
    64 bytes from 64.233.167.99: icmp_seq=0 ttl=244 time=189.655 ms
    64 bytes from 64.233.167.99: icmp_seq=1 ttl=244 time=213.471 ms
    64 bytes from 64.233.167.99: icmp_seq=2 ttl=244 time=257.873 ms
    64 bytes from 64.233.167.99: icmp_seq=3 ttl=244 time=172.745 ms
    64 bytes from 64.233.167.99: icmp_seq=4 ttl=244 time=226.723 ms
    64 bytes from 64.233.167.99: icmp_seq=5 ttl=244 time=171.883 ms
    64 bytes from 64.233.167.99: icmp_seq=6 ttl=244 time=260.308 ms
    64 bytes from 64.233.167.99: icmp_seq=7 ttl=244 time=172.963 ms
    64 bytes from 64.233.167.99: icmp_seq=8 ttl=244 time=198.840 ms
    64 bytes from 64.233.167.99: icmp_seq=9 ttl=244 time=181.215 ms
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    10 packets transmitted, 10 packets received, 0% packet loss
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    BDAqua suggests in a post.
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    208.67.220.220
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    8.8.8.8
    8.8.4.4
    Robert
    =======================================================
    I suggest that you try pinging Google.com.
    Macintosh-HD -> Applications -> Utilities -> Terminal
    mac $ ping -c4 google.com
    PING google.com (64.233.187.99): 56 data bytes
    64 bytes from 64.233.187.99: icmp_seq=0 ttl=245 time=177.617 ms
    64 bytes from 64.233.187.99: icmp_seq=1 ttl=245 time=251.899 ms
    64 bytes from 64.233.187.99: icmp_seq=2 ttl=245 time=169.291 ms
    64 bytes from 64.233.187.99: icmp_seq=3 ttl=245 time=250.119 ms
    --- google.com ping statistics ---
    4 packets transmitted, 4 packets received, 0% packet loss
    round-trip min/avg/max/stddev = 169.291/212.232/251.899/38.894 ms
    mac $ ping -c4 64.233.187.99
    PING 64.233.187.99 (64.233.187.99): 56 data bytes
    64 bytes from 64.233.187.99: icmp_seq=0 ttl=245 time=176.723 ms
    64 bytes from 64.233.187.99: icmp_seq=1 ttl=245 time=247.889 ms
    64 bytes from 64.233.187.99: icmp_seq=2 ttl=245 time=176.890 ms
    64 bytes from 64.233.187.99: icmp_seq=3 ttl=245 time=244.623 ms
    --- 64.233.187.99 ping statistics ---
    4 packets transmitted, 4 packets received, 0% packet loss
    round-trip min/avg/max/stddev = 176.723/211.531/247.889/34.744 ms
    mac $
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    PS.
    You are a little short on stating results. You state what you did, but I have to guess the result.
    Did: X
    Result: Y
    Did:
    1) Power Book's ethernet cable plugged into router port 5. Working to yahoo.com.
    2) Unplugged power book's ethernet cable from router
    3) Plugged eMac's ethernet cable into port 5.
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    Robert

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    0x8fe00000 - 0x8fe2db43 dyld 97.1 (???) <100d362e03410f181a34e04e94189ae5> /usr/lib/dyld
    0x90b98000 - 0x90cffff3 libSystem.B.dylib ??? (???) <b47c8e6e45aef620730710a732bf1930> /usr/lib/libSystem.B.dylib
    0x92188000 - 0x921e5ffb libstdc++.6.dylib ??? (???) <f75e5133d72769de5ce6c06153fc65f6> /usr/lib/libstdc++.6.dylib
    0x92ee9000 - 0x92f14fe7 libauto.dylib ??? (???) <2e44c523b851e8e25f05d13a48070a58> /usr/lib/libauto.dylib
    0x9433f000 - 0x9441ffff libobjc.A.dylib ??? (???) <400e943f9e8a678eea22a1d1205490ee> /usr/lib/libobjc.A.dylib
    0x945fd000 - 0x94689ff7 com.apple.framework.IOKit 1.5.2 (???) <97b9f9d584f48891377f0481b9104434> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
    0x947c8000 - 0x947d6ffd libz.1.dylib ??? (???) <a98b3b221a72b54faf73ded3dd7000e5> /usr/lib/libz.1.dylib
    0x95697000 - 0x95868ffb com.apple.security 5.0.5 (36371) <c13e0bb1acfdcf94be4d3ee118ef190e> /System/Library/Frameworks/Security.framework/Versions/A/Security
    0x95938000 - 0x9596ffff com.apple.SystemConfiguration 1.9.2 (1.9.2) <eab546255ac099b9616df999c9359d0e> /System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfi guration
    0x95a2f000 - 0x95ae1ffb libcrypto.0.9.7.dylib ??? (???) <9d714c92872a93dd127ea8556b2c8945> /usr/lib/libcrypto.0.9.7.dylib
    0x96faf000 - 0x970e2fef com.apple.CoreFoundation 6.5.6 (476.18) <2d52bab73660117571bd6486dc318f8e> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
    0x970e3000 - 0x970e7fff libmathCommon.A.dylib ??? (???) /usr/lib/system/libmathCommon.A.dylib
    0x9722b000 - 0x97232fe9 libgcc_s.1.dylib ??? (???) <e280ddf3f5fb3049e674edcb109f389a> /usr/lib/libgcc_s.1.dylib
    0x97315000 - 0x9744eff7 libicucore.A.dylib ??? (???) <cac059ebdac7d9a63ee0f7a648c9f6cf> /usr/lib/libicucore.A.dylib
    0xfffe8000 - 0xfffebfff libobjc.A.dylib ??? (???) /usr/lib/libobjc.A.dylib
    0xffff0000 - 0xffff1780 libSystem.B.dylib ??? (???) /usr/lib/libSystem.B.dylib

    I had a similar issue with a MacBook Pro. When connecting the network cable, the network preferences would show 'not connected'. I thought it was hardware, but when I transferred the user to another Mac, I found that that ethernet device all the sudden stopped working as well.
    I was able to get the ethernet back with:
    System Preferences
    ->Network
    ->Assist Me...
    ->Diagnostics...
    At some point the ethernet device went green and all was well.
    Maybe this will help.

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