Pieter Grobler wrote: > At 11:10 14/06/1999 +0200, you wrote: > >How secure is a mac adress for satellite multimedia service. How does a > >fire wall use a mac adress > >to secure a web sever or network? > > A MAC address can be easily spoofed (e.g. any PC can change its MAC > address), > it is a little less easy than changing its IP address, but, it is feasible. BTW, how do you change a MAC address in any PC, without Firewalls? > Bottom line, never rely on a MAC address. > > If you want so, a firewall can use static ARP table to statically map > a MAC address to an IP address (provided that the firewall is on the > same subnet as the IP host). You still need to prevent MAC spoofing > (which could be done by using specific hub or switches in port security > mode) > > Hope this helps > > -eric > > > > >---------- > >> From: Eric Vyncke <[EMAIL PROTECTED]> > >> To: Jules <[EMAIL PROTECTED]>; [EMAIL PROTECTED] > >> Subject: Re: IP significant bit addresses > >> Date: Friday, June 11, 1999 10:53 AM > >> > >> Simple answer :-) the number after the '/' is simply the number of > >> bits in the netmask (aka as prefix length) > >> > >> 172.168.10.0/24 means subnet 172.168.10.0 with netmask 255.255.255.0 (3 > >octets with > >> 255 => 3*8 = 24 of prefix length) > >> 172.16.51.50/32 means hosts address 172.16.51.50 (32 bits are used) > >> > >> Just my 0.01 EUR > >> > >> -eric > >> > >> At 19:12 09/06/1999 +0800, Jules wrote: > >> > > >> >This is a newbie question, I've checked almost every resource available > >to > >> >me, but I still don't really grasp this concept, so if anyone can > >clarify > >> >it for me, I'd be grateful. > >> > > >> >How does one read addresses like 172.168.10/24 or 172.16.51.50/32 ? > >> > > >> >In particular, what does the slash signify what does it do in the above > >> >case(s). > >> > > >> >If this is anywhere off topic for the list, personal e-mail will do > too. > >> >Thanks in advance. > >> > > >> >Cheers! > >> >-J > >> > > >> >- > >> >[To unsubscribe, send mail to [EMAIL PROTECTED] with > >> >"unsubscribe firewalls" in the body of the message.] > >> > > >> Eric Vyncke > >> Consulting Engineer Cisco Systems EMEA > >> Phone: +32-2-778.4677 Fax: +32-2-778.4300 > >> E-mail: [EMAIL PROTECTED] Mobile: +32-75-312.458 > >> - > >> [To unsubscribe, send mail to [EMAIL PROTECTED] with > >> "unsubscribe firewalls" in the body of the message.] > > > Eric Vyncke > Consulting Engineer Cisco Systems EMEA > Phone: +32-2-778.4677 Fax: +32-2-778.4300 > E-mail: [EMAIL PROTECTED] Mobile: +32-75-312.458 > > - > [To unsubscribe, send mail to [EMAIL PROTECTED] with > "unsubscribe firewalls" in the body of the message.]
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