Re: mysterious routes appearing

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:  [email 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



-- 
Psyche-list mailing list
[email protected]
https://www.redhat.com/mailman/listinfo/psyche-list