Exchange , spamhous & ολίγον από network tracing
?e??t?? ???s?µ?p??e? ??a anti-spam ??s? t?? ??ste? p?? d?a??te? d??e?? ? www.spamhaus.org, ? s???e???µ??? ?p??es?a p??sf??eta? d??e?? ?a? ?e?t????e? µe t? ???s? dns queries. ??e? ???µ?ste? ???p?? ? Exchange s?µf??a µe t?? ?d???e? p?? d????ta? st? p??????µe?? site a??? t?? te?e?ta?? ?a??? ????? ?a a????e? ??t? (?p?? p??ta) ?? ???ste? ????? a???se? ?a ?aµß????? µe???? a???µ? ap? spam mails, ?p?te af?? ß??p??µe p?? ? Exchange de???e? s?st? ???µ?sµ???? ??????µe µ?a ep? p???? µat??.
? ?p??es?a ???p?? ?e?t????e? ?? e???, ? mail server ?ta? d??eta? e?se???µe?? a???????af?a e????e? t?? IP (p.?. 192.168.0.1) t?? ap?st???a ?????ta? t? query 1.0.168.192.zen.spamhous.org. ?ts? se ?p???? dns ?a? ?a ???e? t? e??t?µa te???? ?a p??pe? ?a p??e? t? s?st? ap??t?s? µ?a? ?a? t? domain e??a? t? zen.spamhous.org. ???a a?a????? t?? ap??t?s? ? mail server ?ata?aßa??e? a? p???e?ta? ??a spam sender ? ???.
?p?te 1? ß?µa ?ta? ?a d??µe a? ? Exchange ??t?? ???e? a?t? p?? p??pe? d??ad? ?a st???e? ta e??t?µata, ??a network trace µa? d??e? t?? ap??t?s?
?a?ap??? fa??eta? ? e??t?s? ??a t?? IP 116.71.33.70 (??µ??e? ptr record a??? de? e??a?)
?? ed? fa??eta? ? ap??t?s? ??a t?? e??t?s?, “No such name” µe ß?s? t?? ?d???e? ap? t? spamhaus ? IP e??a? e?t??e? ?a? µp??e? ?a p??????se? ? smtp ep????????a.
???s??te st? set e??t?s??-ap??t?s?? p?? ?p???e? t? Transaction ID, ??t? p??? ???s?µ? ??at? de s?µa??e? p??ta p?? ? ap??t?s? ??a t? dns query e??a? p??ta t? aµ?s?? ep?µe?? pa??t?, ?p?te µp????µe ?a ?????µe µe t? Transaction ID p?? e??a? ?????.
??e????ta? t?? pa?ap??? pa????es? fa??eta? ???p?? p?? ? Exchange ??t?? ???e? t?? e??t?se?? p?? p??pe? ?a? pa???e? apa?t?se?? ????? p??ß??µa ap? ??p??a e?d??µes? s?s?e?? ? ??t? ???? pe??e???. ?? ep?µe?? ß?µa ?ta? ?a ß?? ??p??a spammer IP ?a? ?a d???µ?s??µe ?ate??e?a?, ???s?µ?p????ta? ???p?? t? https://spam-ip.com/list-1.html d?a???? t?? “hausernamef6 70.77.56.209 toddbutler1128@aol.com.
?p?te ???? t? dns query st?? DNS p?? ???s?µ?p??e? ? pe??t?? (8.8.8.8)
C:\>nslookup 209.56.77.70.zen.spamhaus.org 8.8.8.8
Server: google-public-dns-a.google.com
Address: 8.8.8.8
*** google-public-dns-a.google.com can't find 209.56.77.70.zen.spamhaus.org: Non-existent domain
??t?? ? s???e???µ???? DNS ep?st??fe? t? ???st? ap??t?s? p?? d????e? p?? ? e???af? e??a? ?a?a??.
?p???asµ???? ???? t? ?d?? e??t?µa se ??p???? ????? DNS
C:\>nslookup 209.56.77.70.zen.spamhaus.org 194.30.220.110
Server: ns0.hol.gr
Address: 194.30.220.110
Non-authoritative answer:
Name: 209.56.77.70.zen.spamhaus.org
Address: 127.0.0.11
?p?? ß??pete ???p?? ? ap??t?s? p?? ep?st??fe? d????e? p?? ? IP a???e? se ??p???? spammer (pe??ss?te?a ed? https://www.spamhaus.org/faq/answers.lasso?section=DNSBL Usage#252)
?? s???ß? ???p??; ? Google t??? Public DNS ?a? p??fa??? de d??e? apa?t?se?? ??a ta s???e???µ??a domain. ?p??????µa? p?? ????e ??at? ?? public DNS p????????ta? ??a ap?? web browsing ?a? ??? ???s? t?t???? ?p??es??? p?? ß?µßa?d????? ??????e?t??? t??? DNS s??e??? µe dns queries.