I will annotate the routes in question for you.
djh wrote:
On 24 Jun 2003, Iain Buchanan wrote:This is an implicit network route, pointing 172.16.0.0/255.255.255.0 to the default route on eth0.
Now I do ifdown eth0 and then ifup eth0 and the routes come back again. Then I run redhat-config-network and the routes are listed under eth0. Any more ideas?
route -n: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 203.16.234.0 172.16.0.8 255.255.255.0 UG 0 0 0 eth0 172.16.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
This is the network route for the loopback interface {lo0}, it must exist or your machine can not run.203.39.28.0 172.16.0.4 255.255.255.0 UG 0 0 0 eth0 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
This is your default route also known as your "gateway", if you want to connect to the internet you must have a "gateway".0.0.0.0 172.16.0.4 0.0.0.0 UG 0 0 0 eth0
I think that if you are having connectivity problems it is because you are not using "publicly routable" ip addresses.
The ok routes are obviously 2, 4 & 5. The other two come back all the time!
It should be in /etc somewhere.. grep -r 203.16.234 /etc 2>/dev/null
David.
Below you will see that all ip addresses from 172.16.0.0 - 172.31.255.255 are reserved, and therefore not routable through the internet :
----Start---- OrgName: Internet Assigned Numbers Authority OrgID: IANA Address: 4676 Admiralty Way, Suite 330 City: Marina del Rey StateProv: CA PostalCode: 90292-6695 Country: US
NetRange: 172.16.0.0 - 172.31.255.255 CIDR: 172.16.0.0/12 NetName: IANA-BBLK-RESERVED NetHandle: NET-172-16-0-0-1 Parent: NET-172-0-0-0-0 NetType: IANA Special Use NameServer: BLACKHOLE-1.IANA.ORG NameServer: BLACKHOLE-2.IANA.ORG Comment: This block is reserved for special purposes. Comment: Please see RFC 1918 for additional information. Comment: RegDate: 1994-03-15 Updated: 2002-09-12
OrgTechHandle: IANA-ARIN OrgTechName: Internet Corporation for Assigned Names and Number OrgTechPhone: +1-310-823-9358 OrgTechEmail: res-ip@xxxxxxxx
# ARIN WHOIS database, last updated 2003-06-23 21:05 # Enter ? for additional hints on searching ARIN's WHOIS database. ----End----
Assuming that 172.16.0.8 and 172.16.0.4 are devices that are able to route traffic, then you should be OK.
Guy
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