AirNet (PPTP) on linux. Overview Requirements MPPE Security Installation Configuration Getting it going Examples Resources (links)
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1 AirNet (PPTP) on linux Overview Requirements MPPE Security Installation Configuration Getting it going Examples Resources (links)
2 VPN, PPTP & AirNet What is VPN? What is PPTP? How does AirNet work Signing up for AirNet Is AirNet the right solution?
3 PPTP Requirements: PPP (>2.4.2) MPPE linux kernel(>2.6.15*) pptp-linux Routing scripts
4 MPPE Microsoft Point-to-Point Encryption (RFC 3078) Encrypts using RC4 128bit, but there is less entropy in reality Data compression (patented MPPC algorithm) Linux issues Support is finally here Supported with kernel or greater Old kernels can be patched
5 Security Authentication PPTP uses MS-CHAPv2 susceptible to brute force attack if data stream is captured Use strong passwords (although school assigns them) MPPE uses RC4 stream encryption key can be derrived from MS-CHAPv2 credentials All in all AirNet might still be more secure than ResNet
6 Installing pptp-linux Debian/ubuntu apt-get install pptp-linux FC1-5, gentoo, madrake, netbsd, redhat, suse RTFM (: pptpconfig GUI configuration tool Not needed
7 Configuration pptpconfig vs config by hand Download my config files and Edit: /etc/ppp/chap-secrets Line 3 /etc/ppp/ip-up.local (overrides routing scripts) Line 5 /etc/ppp/ip-down.local (overrides routing scripts) Line 5 /etc/ppp/pap-secrets Line 43 /etc/ppp/peers/sunysb Line 2
8 ~# iwconfig $INTERFACE essid $ESSID ~# ifup $INTERFACE Getting it going ~# pon $TUNNEL # or OR ~#pon $TUNNEL debug dump logfd 2 nodetach # for debuging ~# poff $TUNNEL ~# ifdown $INTERFACE
9 ilya lap:~# pon sunysb debug dump logfd 2 nodetach pppd options in effect: debug # (from command line) nodetach # (from command line) logfd 2 # (from command line) dump # (from command line) noauth # (from /etc/ppp/options.pptp) name $USERNAME # (from /etc/ppp/peers/sunysb) remotename PPTP # (from /etc/ppp/peers/sunysb) # (from /etc/ppp/options.pptp) pty pptp vpn.sunysb.edu nolaunchpppd # (from /etc/ppp/peers/sunysb) crtscts asyncmap 0 lcp echo failure 4 lcp echo interval 30 hide password ipparam tunnel # (from /etc/ppp/peers/sunysb) proxyarp nobsdcomp # (from /etc/ppp/options.pptp) nodeflate # (from /etc/ppp/options.pptp) require mppe 128 # (from /etc/ppp/peers/sunysb) noipx using channel 7 Using interface ppp0 Connect: ppp0 < > /dev/pts/23 sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x3d1500ea> <pcomp> <accomp>] rcvd [LCP ConfReq id=0x0 <auth chap MS v2>] sent [LCP ConfAck id=0x0 <auth chap MS v2>] rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x3d1500ea> <pcomp> <accomp>] sent [LCP EchoReq id=0x0 magic=0x3d1500ea] rcvd [CHAP Challenge id=0x1 <STUFF>, name = ""] sent [CHAP Response id=0x1 <STUFF>, name = "$USERNAME"]
10 rcvd [LCP EchoRep id=0x0 magic=0x0] rcvd [CHAP Challenge id=0x2 <STUFF>, name = ""] sent [CHAP Response id=0x2 <STUFF>, name = "$USERNAME"] rcvd [CHAP Success id=0x2 "S=STUFF"] CHAP authentication succeeded sent [CCP ConfReq id=0x1 <mppe +H M +S L D C>] rcvd [IPCP ConfReq id=0x0 <addr >] sent [IPCP TermAck id=0x0] rcvd [CCP ConfReq id=0x0 <mppe +H M +S +L D +C>] sent [CCP ConfNak id=0x0 <mppe +H M +S L D C>] rcvd [CCP ConfNak id=0x1 <mppe +H M +S L D C>] sent [CCP ConfReq id=0x2 <mppe +H M +S L D C>] rcvd [CCP ConfReq id=0x1 <mppe +H M +S L D C>] sent [CCP ConfAck id=0x1 <mppe +H M +S L D C>] rcvd [CCP ConfAck id=0x2 <mppe +H M +S L D C>] MPPE 128 bit stateless compression enabled sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr >] rcvd [IPCP ConfReq id=0x1 <addr >] sent [IPCP ConfAck id=0x1 <addr >] sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr >] rcvd [IPCP ConfRej id=0x1 <compress VJ 0f 01>] sent [IPCP ConfReq id=0x2 <addr >] rcvd [IPCP ConfNak id=0x2 <addr >] sent [IPCP ConfReq id=0x3 <addr >] rcvd [IPCP ConfAck id=0x3 <addr >] found interface wlan0 for proxy arp local IP address remote IP address Script /etc/ppp/ip up started (pid 580) Script /etc/ppp/ip up finished (pid 580), status = 0x0 Terminating on signal 2 Script pptp vpn.sunysb.edu nolaunchpppd finished (pid 570), status = 0x0 Modem hangup
11 Connect time 50.1 minutes. Sent bytes, received bytes. Script /etc/ppp/ip down started (pid 1110) MPPE disabled sent [LCP TermReq id=0x2 "MPPE disabled"] Connection terminated. Script /etc/ppp/ip down finished (pid 1110), status = 0x0
12 Example ilya-lap:~# iwconfig wlan0 mode managed && iwconfig wlan0 essid AirNet ilya-lap:~# ifup wlan0 ilya-lap:~# pon sunysb ilya-lap:~# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface prv.no-wire.sto * UH wlan * U wlan0 default * U wlan0 ilya-lap:~# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface prv.no-wire.sto * UH wlan0 prv.no-wire.sto * UH ppp * U wlan0 default * U ppp0
13 Resources Step by step guides trouble shooting tips Configure routing scripts my config files
14 Presentation by Ilya Sukhanov (dotcommie) contact: mailing list:
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4Gon Tel: +44 (0) Fax: +44 (0)
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