Itamar Ravid <[EMAIL PROTECTED]> writes: > While talking to the representative, he mentioned something > regarding direct connections using DHCP. I asked him more about it, > and got the answer that I only have to call Aruzey Zahav, verify the > matter with them and the PPTP tunnel issue will be gone and I will > connect directly using DHCP. I`m using cables, by the way.
OK, I recently switched from ADSL (via PPTP, of course) to cable, and I am connected through DHCP now, no PPTP, so I went through he whole procedure. Here is the deal as I understand it (my ISP is not Internet Zahav but 012, I doubt it makes any difference). The cable company gives you the physical infrastructure, including modem, and connects you to their DHCP server. They do not, however, connect you to the internet, in the sense that you are not routed to any interesting places beyond the cable company itself. You can get to the cable web site, check the connection speed, download an ISP dialer if you need one, and that's about it. Your real Internet connection is handled by the ISP. In general, they need to give you an IP address from the pool assigned to them. To that end, they can make you dial into their server via PPTP, and once you do that your ppp0 interface gets an IP address and whatever you send out of it gets routed to the rest of the universe. Or they can tell the cable company to set their (the cable company's) DHCP server to give you a semi-permanent (very long lease) IP address from the ISP's pool, and thus your eth[0-9] interface becomes your link to the world, no dialer needed. So, the cable company is right - they need an authorization from the ISP to connect you without a dialer. They cannot give you an address from the ISP's pool without it. How you arrange matters with the ISP is between you and them though. In my case, the cable company initially screwed up and I was listed with them as requiring a dialer. Once 012 sent an email to AZ they switched me to DHCP. I am getting a business grade service, but I don't know if PPTP-less connection is conditioned on that. The security issue has been discussed here in the past. Check the archives. Shachar Shemesh pointed out, rightly, that if someone forges your MAC address (something that is well beyond the technical ability of my elderly next-door neighbours, but in general feasible), gets your IP address, and starts sending encrypted emails to known Al Qaeda operators and/or drug traffickers, or spams the world with child pornography, you may get visitors at an inconvenient hour. > The point in this post - I was wondering if there is anyone here who > connects directly using DHCP. Using the PPTP dialer slows my > boot-process by ~15 seconds, since the PPTP tunnel apparently takes > some time to be established. Also, if I wasn't using a GRE tunnel, > my Netfilter matters would be less complicated. Boot time was never an issue for me - I keep my computers and connections on. I didn't change my iptables rules except that my internet interface is now eth0 and not ppp0, which was a change in a variable assignment at the top of the script. YMMV - your needs may be different. A big difference for me is that the connection is now *much* more reliable - ADSL was dropped from time to time, especially during Saturdays. Cable seems much more stable, but whether or not it is related to cable vs. ADSL or to DHCP vs. PPTP I cannot say. -- Oleg Goldshmidt | [EMAIL PROTECTED] ================================================================= To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
