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Re: subnetting help
On Tuesday 18 March 2003, at 22 h 24,
Stephane Bortzmeyer <bortzmeyer at gitoyen.net> wrote:
> I must confess I cannot make head nor tail from it. Can you draw a nice ASCII
> diagram of your network? With the *names* (names are necessary for
> communication)
> of the machines and the links between them?
Here is an example of a (IMHO) proper way to describe a network. I do not know
how close it is from yours, because you provide very few details and it is
often confusing.
1) You draw the network.
TO THE INTERNET
+--------------------+ Management network 64.110.88.0/28
|SuperNet | --------+------
|(upstream provider) | |
+--------------------+ |
| |
| Serial0 | eth1 (.1)
+---------------+ +----------------+
| nelson | | steve |
|(cisco router) | | (linux router) |
+---------------+ +----------------+
/ | | Ethernet0 (.65) | eth0 (.68)
/ | +----------------------------------------------
/ | Backbone 64.110.88.64/26
PtP links
to customers
64.110.88.32/27
2) You give the actual configuration (not a summary, not a translation)
! nelson, cisco router
ip subnet-zero
ip classless
interface Ethernet0
! /26
ip address 64.110.88.65 netmask 255.255.255.192
interface Serial0
ip unnumbered Ethernet0
! Interfaces to PtP customers omitted
ip route 64.110.88.88 255.255.255.240 64.110.88.68
# steve, Linux router
ifconfig eth0 64.110.88.68 netmask 255.255.255.192 # /26
ifconfig eth1 64.110.88.1 netmask 255.255.255.240 # /28
route add -net 64.110.88.32/27 gw 64.110.88.65
route add default gw 64.110.88.65
3) You can ask your question, with actual facts (output of commands, copy of
log files, not vague interpretations)
From steve, I can get to the PtP customers and to any machine in my network.
But why can't I reach the Internet from steve? I get:
~ % traceroute www.google.com
traceroute to www.google.com (216.239.39.104), 30 hops max, 38 byte packets
1 nelson.example.com (64.110.88.65) 1.864 ms 1.689 ms 1.334 ms
2 nelson.example.com (64.110.88.65) 1.443 ms !N 1.403 ms !N 1.173 ms !N
4) And you get a reply. (There is no default route on nelson, add "ip route
0.0.0.0 0.0.0.0 Serial0")
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