 | | | mysterious routes appearing | mysterious routes appearing 2003-06-24 - By Guy Fraser
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Hi
I will annotate the routes in question for you.
djh wrote:
>On 24 Jun 2003, Iain Buchanan wrote:
>
>
>>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 an implicit network route, pointing 172.16.0.0/255.255.255.0 to
the default route on eth0.
>>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 the network route for the loopback interface {lo0}, it must
exist or your machine can not run.
>>0.0.0.0 172.16.0.4 0.0.0.0 UG 0 0 0 eth0
>>
This is your default route also known as your "gateway", if you want to
connect to the internet you must have a "gateway".
>>
>>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.
>
>
>
I think that if you are having connectivity problems it is because you
are not using "publicly routable" ip addresses.
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@(protected)
# 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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