Many thanks to the following:
Larry Chin <firstname.lastname@example.org>
email@example.com (Abdi M. Oday)
Mike Raffety <firstname.lastname@example.org>
Colin Macleod <email@example.com>
paulo%dcc.unicamp.br@UICVM.UIC.EDU (Paulo L. de Geus)
ricardo%cmp.unicamp.br@UICVM.UIC.EDU (Ricardo K. Aguilera)
firstname.lastname@example.org Tue May 26 22:22:32 1992
> We have recently subnetted our local class C network (192.82.225) as follows:
(drawing changed from original to reflect reality 8-)
darwin | <
126.96.36.199 | < subnet 128
domain nameserver | <
188.8.131.52 | |
> | hosts
subnet 0 > | 184.108.40.206-254
> | all netmasks ffffff80
all netmasks ffffff80
> ftp, telnet, rlogin, mount, etc between both local subnets is ok.
> telnet, mail, and ftp from subnet 0 to the internet are ok.
> ftp and telnet from subnet 128 to internet do not work.
> ping from subnet 128 to internet hostname results in "unknown host".
The problem was with the netblazer which does not have a netmask as such
but a parameter which specifies the number of bits in the address to
use for routing. Once this was changed to 25, everything worked fine,
and the subnet 128 machines could then get to the internet. The en0
parameter is just our ethernet backbone.
Dest Len Interface Gateway Metric
220.127.116.11 25 en0 18.104.22.168 1
22.214.171.124 24 en0 1
In retrospect, the whole process now seems straight-forward.
1. Change ip addresses in /etc/hosts file on each machine to
reflect the new net topology.
2. Change the netmasks file on each machine to set the new netmask.
In our case:
# network netmask
3. On NIS master, remake the NIS data base:
darwin: cd /var/yp
darwin: make netmasks
4. Boot all machines.
5. Use netstat -rn to check the routing tables and
ifconfig -a to check the network interfaces.
Relevant FM References:
Sun System & Administration Manual (Networking & DNS chapters)
Southwest Foundation For Biomedical Research
San Antonio, Texas
fax: (512) 674-2126
voice: (512) 674-1410
Does the fact that the airplane is faster than the horse make
the world any better?
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