mirror of https://github.com/dirtbags/moth.git
58 lines
2.4 KiB
Plaintext
58 lines
2.4 KiB
Plaintext
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This directory contains the files used to set up an OpenWRT router.
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Bear in mind that the cheap consumer routers have relatively slow CPUs
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and won't stand up to high volume. This same configuration applies to
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OpenWRT running on an x86 PC, or any other target of OpenWRT. For
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larger contests, it would be a good idea to use a faster machine for the
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router. I don't have any specific recommendations at this time (Oct
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2010).
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The router comes up as 10.0.0.1/16 on eth0.
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If the router has a built-in switch, it is brought up without VLAN
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support, since these switches typically only support 16 VLANs, and do
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not support QinQ (double VLAN tags). All 5 ports work like an unmanaged
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switch, which ends up being handy for the contest table.
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Plugging a managed switch into the router enables access to 48 VLANs,
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each configured to a /16 network. The router on VLAN number v comes up
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as 10.v.0.1/16.
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If the router has the ability to come up as a wireless access point, it
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will do so with SSID "CTF" and IP 10.254.0.1/16.
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All subnets can route to all other subnets, through the router.
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10.0.0.1/16 and 10.254.0.1/16 may have a higher TTL when routed to a
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VLAN (I haven't checked). Keep in mind that anything connected directly
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to the router (ie. not through the managed switch) can do its own VLAN
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tagging. This would be the way to hop on another team's subnet to do
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something like check service availability in such a way as to prevent
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teams from firewalling each other out.
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SSID "CTF"
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10.254.0.1/16
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((Y))
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-------------
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| OpenWRT |
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-0-1-2-3-4---
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/| | | | |
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/ | | | | |
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/ 10.0.0.1/16
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/
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-------------------t---
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| Managed Switch |
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-1-2-3-4-5-...-47-48---
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/ | | \
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/ | | \
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/ | | \
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/ | | \
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10.1.0.1/16 | | 10.48.0.1/16
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10.3.0.1/16 |
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10.47.0.1/16
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