On Fri, 22 Jun 2001, M.F. PSIkappa wrote: > On Fri, 22 Jun 2001, Arthur van Leeuwen wrote: > > > > > > it's posibility to make something similar to Cisco unnumber on Linux ? > > > > > E. g. > > > > > interface Serial0 > > > > > ip unnumbered Ethernet0 > > > > > I don't want to assign to interface private IP. > > > > > > > > If I understand the ip unnumbered command correctly it allows you to share a > > > > single IP address on multiple interfaces. This is trivial on Linux: just add > > > > the same IP address to each of the interfaces with ip addr add > > > > > > > > The routing effects I cannot correctly comment on, as I'm not sufficiently > > > > versed in IOS to fully grasp the effects of ip unnumbered > > > > > > No, it's incorrect, unnumberd allow you to connect 2 router without IP > > > adresses. > > > > > > 192.168.0.1/24 [cisco]unnumbered-----unnumberd[cisco] 192.168.2.1/24 > > > > > > It's special case of point-to-point connection. In linux if I make > > > point-to-point connection I have to assign any IP on both endpoint of > > > connection. > > > > What is the difference with > > > > 192.168.0.1/24 [linux] 192.168.0.1 ------- 192.168.2.1 [linux] 192.168.2.1/24 > > > > if I may be so bold to ask? Yes, the routing effects may be different, and I > > mentioned that might be a problem, but the unnumbered thing looks like a > > cisco-specific hack... > > Difference is in traceroute. Unnumbered is invisible, if I assign IP I see > it in traceroute, but I can make hack that make this connection invisible, > but it's rfc break ... Ah, but iptable's mangle module will let you play around with the TTL field of packets being forwarded through a linux box. Yes, it takes some more configuring, but the behaviour can be duplicated. And that is not considered a hack. Besides, ever heard of masquerading? That is nowhere near RFC compliance... and should theoretically be impossible, if I'm to believe Jos Vos (one of the first implementers). Doei, Arthur. -- /\ / | arthurvl@xxxxxxxxxx | Work like you don't need the money /__\ / | A friend is someone with whom | Love like you have never been hurt / \/__ | you can dare to be yourself | Dance like there's nobody watching
