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Posted by on May 23, 2005, 4:02 pm
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Schools subnet = 10.0.0.1 Class subnet 10.0.0.1 -- can't connect to
internet
Don't know if this is exactly a firewall issue.
My school allows us to do a little lan gaming in one computer lab. I
like to set up my dlink to pass out 10.0.0.x addresses because it's
easy to type in. Games and map servers are under 10.0.0.100. My
gateway is 10.0.0.1. I connect that to the schools system (lets call
it a linksys) which is also a 10.0.0.x subnet.
I use the DLINK because there's a bunch of windows shares I don't want
the gamers getting to and it seems to isolate them. But when I have
both subnets set to 10.0.0.x I can't seem to connect to the internet.
I set the linksys to 192.168.0.x , reset both switches, and suddenly I
could hit the net. But of course if I mess something up on the linksys
Im dead.
Is the problem with linksys firewall? Or is it a problem that both
switches have gateways pointing to 10.0.0.1? I thought that having
that as the gateway would just push the traffic out the door to the
internet.
TIA
Zipper
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Posted by keme on May 24, 2005, 9:37 am
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[...]
>
>Is the problem with linksys firewall? Or is it a problem that both
>switches have gateways pointing to 10.0.0.1? I thought that having
>that as the gateway would just push the traffic out the door to the
>internet.
>
[...]
Some details are missing, so I'll do some guessing here:
Is your "dlink network" set up with the D-link as a router, so that it is
the only gateway to the rest of the school network? (Should be, to isolate
the networks.) If it is, does it do NAT?
If not, you have to make sure you don't distribute the same IP ranges from
both units. (The success when you use a different private range suggests
that this may be part of your problem.)
If your Dlink is set up as a NAT router, it may have a static external
address, probably in the 192.168.x.x range. For it to work you need to set
the external address to somewhere in the "linksys" ip subnet and outside the
linksys DHCP range, or you could set it to obtain IP automatically (from
DHCP), if that's an option.
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Posted by Moe Trin on May 24, 2005, 7:51 pm
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>But when I have both subnets set to 10.0.0.x I can't seem to connect to
>the internet. I set the linksys to 192.168.0.x , reset both switches, and
>suddenly I could hit the net.
Think of the subnets as streets. You have two "streets" with the same
name. How do you get from 123 Elm Street to 145 Elm Street? Are they
really on the same street, or on two different streets that have the same
name? Honest and true - computers can't read your mind - you have to tell
them what to do. When the "street names" (networks) are not the same, there
is no confusion of where to go. However, for this to work, hosts on both
networks have to know how to reach the "other" network. I suspect your
router is NATing the addresses on "your" net, so that they appear to be
coming from a single host on the "other" net.
>I thought that having that as the gateway would just push the traffic out
>the door to the internet.
Well, that might be, but does the host on the internet know how to send
packets back to you - so that you can have a conversation, or is that host
just receiving packets from some unknown computer that it doesn't know
how to talk to. At every step from "here" to "there" everyone has to know
how to send packets to "here" and to "there" If it can't find "here" or
"there" there is no conversation - no connection.
Old guy
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