>The IP addresses showed up in the traceroutes are the "source IP addresses"
>in the returning packets. Normally, routers route packets using the
>destination IP addresses in the packets. The destination IP address in the
>returning packets is your machine's IP address, that how you were able to
>receive the traceroute info, but the info displayed is the IP addresses of
>the hosts who sent the returned packets, so you can still receive traffic
>sourced from machines with private IP addresses.
>
>HTH,
>
>Rog
Yes, but allowing packets that have source addresses to which you
have no reverse path is unwise at best. See
RFC 2827 Network Ingress Filtering: Defeating Denial of Service Attacks
which employ IP Source Address Spoofing. P. Ferguson, D. Senie. May
2000. (Format: TXT=21258 bytes) (Obsoletes RFC2267) (Also BCP0038)
(Status: BEST CURRENT PRACTICE)
>
>> -----Original Message-----
>> From: Leigh Anne Chisholm [mailto:[EMAIL PROTECTED]]
>> Sent: Sunday, February 25, 2001 5:01 PM
>> To: Cisco@Groupstudy. Com
>> Subject: Private Internet Addressing
>>
>>
>> I did a traceroute to one of US West's customers... got some
>> interesting results:
>>
>> 13 206 ms 179 ms 123 ms
>> gig0-0-0.phnx-sust1.phnx.uswest.net [206.80.192.253]
>> 14 1016 ms 151 ms 975 ms 207.224.191.2
>> 15 233 ms 124 ms 123 ms 192.168.8.1
>> 16 151 ms 179 ms 123 ms 192.168.100.147
>> 17 247 ms 192 ms 151 ms
>> vdsl-130-13-102-120.phnx.uswest.net [130.13.102.120]
>>
>> RFC 1918 - "Address Allocation for Private Internets"
>> indicates 192.168.0.0 through 192.168.255.255 (192.168/16
>> prefix) is reserved
>> for private internets. Hops 15 and 16 in my traceroute show
>> that addresses within this range are being used publically.
>>
>> Did I miss something? Have the "for private use only" IP
>> addresses now been given the green light to be used within
>> the internet?
>>
>>
>> -- Leigh Anne
>>
>>
>>
>>
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