Forum Discussion
Altera_Forum
Honored Contributor
14 years agoroot@shell~# tcpdump -i eth1 'port 53'
listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes 14:38:28.256050 IP 192.168.2.7.56458 > 192.168.2.1.domain: 9082+ Type62321? download.altera.com. (37) 14:38:28.275545 IP 192.168.2.7.33392 > 192.168.2.1.domain: 42540+ PTR? 1.2.168.192.in-addr.arpa. (42) 14:38:28.300554 IP 192.168.2.1.domain > 192.168.2.7.33392: 42540 NXDomain 0/1/0 (119) 14:38:28.300770 IP 192.168.2.7.56161 > 192.168.2.1.domain: 41479+ PTR? 7.2.168.192.in-addr.arpa. (42) 14:38:28.320586 IP 192.168.2.1.domain > 192.168.2.7.56458: 9082 2/1/0 CNAME download.altera.com.edgesuite.net., CNAME a390.d.akamai.net. (170) 14:38:28.450572 IP 192.168.2.1.domain > 192.168.2.7.56161: 41479 NXDomain 0/1/0 (119) umm. NXDomain. but the akamai.net host exists. but 192.168 address doesn't have a reverse reference... but why does it bother?