Nmap Development mailing list archives
Fixing traceroute results over PPP connections
From: Gerardo García Peña <killabytenow () gmail com>
Date: Thu, 8 Feb 2018 12:34:49 +0100
Hello, I have made the following PR on github: https://github.com/nmap/nmap/pull/1132 I only have introduced a little exception, but if you feel that it needs more fine tuning I would try to do my best for improving this patch. Thanks! ge The PR text: I have observed that traceroute tasks are completely ignored when they are executed through a PPP connection. Having following configuration (a standard PPPoE home configuration): $ ifconfig -a [...removed output...] eth1 Link encap:Ethernet HWaddr 00:e0:7d:e1:9c:10 inet6 addr: fe80::2e0:7dff:fee1:9c10/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 [...removed output...] eth1.20 Link encap:Ethernet HWaddr 00:e0:7d:e1:9c:10 inet6 addr: fe80::2e0:7dff:fee1:9c10/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 [...removed output...] ppp0 Link encap:Point-to-Point Protocol inet addr:100.64.130.110 P-t-P:100.64.128.1 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1 RX packets:4448395 errors:0 dropped:0 overruns:0 frame:0 TX packets:2528589 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3 RX bytes:4906634151 (4.9 GB) TX bytes:461943020 (461.9 MB) [...removed output...] If we try executing a nmap traceroute we will obtain the following deceiving results: $ sudo nmap -sn -Pn --traceroute kung-foo.net Starting Nmap 7.01 ( https://nmap.org ) at 2018-02-08 12:27 CET Nmap scan report for kung-foo.net (5.135.152.106) Host is up. TRACEROUTE HOP RTT ADDRESS 1 -- kung-foo.net (5.135.152.106) Nmap done: 1 IP address (1 host up) scanned in 0.01 seconds Instead of obtaining the following output if we apply this little patch: $ sudo ./nmap -sn -Pn --traceroute kung-foo.net Starting Nmap 7.60SVN ( https://nmap.org ) at 2018-02-08 12:28 CET Nmap scan report for kung-foo.net (5.135.152.106) Host is up (0.059s latency). TRACEROUTE (using proto 1/icmp) HOP RTT ADDRESS 1 47.48 ms 100.64.128.1 2 46.07 ms 10.15.0.49 3 46.34 ms 10.15.246.6 4 44.17 ms 10.15.2.14 5 44.68 ms decix.mad-1-a9.es.eu (185.1.68.65) 6 58.78 ms be100-1157.gsw-1-a9.fr.eu (91.121.131.153) 7 62.99 ms be100-1044.rbx-g2-nc5.fr.eu (94.23.122.214) 8 60.31 ms 10.95.64.3 9 84.75 ms vl7.vss-10a-6k.fr.eu (178.33.100.204) 10 59.01 ms kung-foo.net (5.135.152.106) Nmap done: 1 IP address (1 host up) scanned in 0.24 seconds
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Current thread:
- Fixing traceroute results over PPP connections Gerardo García Peña (Feb 17)