Gmail дає змогу чіпляти до листа різні мітки, які з точки зору протоколів витягування пошти (POP3 та IMAP4) є скриньками. В принципі, інтерфейс Gmail також їх показує як скриньки з листами. Іноді у різних рецептах (згодувати spamassassin’у теку «Спам» із гуглопошти, наприклад) окремим пунктом програми … Continue readingGmail, IMAP та «мітки» кирилицею
This info was tested with kernels 2.6.26 and 2.6.32. Caution, 2.6.31, looks like, has some nitpicks. Well, I did not examine cls_u32.c etc-etc — so I can be wrong .) Some notes regarding «filtering logic»: When we write tc filter … protocol <proto> u32 match u<length> … Continue readingtc filter … protocol 802.1q … u32 and filtering VLAN tagged packets
I have rebrandered my snmp traffic grapher (see here) — now it is SPy Bulk Grapher, or SPyBG, hip-hop!-) — and created a repository at github: SPyBG. This happened (i had not thought of this before, at all) because i started to feel like i … Continue readingGraphing SNMP counters with Python
Having used IRRToolSet in elder Ubuntu releases (elder compilers, libraries etc), i finally decided to compile it under 9.10 (yes, previously made RtConfig works under 9.10 too, «but anyway»). But something goes wrong, with several files — illegal conversion and «bad» syntax and the like. So, … Continue readingMaking RtConfig (IRRToolSet) in Ubuntu
I’ve decided to make it available after some nice people asked for this. Now i have no time and, let’s say, health to make it better, so please don’t complain :-) I guess it maybe would be better to make it available somewhere at code.google.com — … Continue readingDjango-based HTB shaper configurator
Hash-tables based shaper can act as an effective firewall; just take a look. Now our shaper configurator generates, let’s say, this script for a client’s connection (excerpt): # # Contract I-1082, # connection 606 (0x25e). # # input: /sbin/tc class add dev clients0 classid 1:25e … Continue readingShaper as an effective firewall
If you wish to use vlan sub-interfaces in linux, and sub-sub-interfaces, and sub-sub-sub-… and if you wish to ping something — sure, you may wish to have them only for switching, but if you wish to ping — don’t forget to re-set REORDER_HDR flag: ip link set … Continue readingREORDER_HDR, again and again
Well.. I’ve done my django based configurator for my HTB shaper (bridge/linux). I will try to translate this post in english; if you can read Ukrainian, try here. *subj* :-) Давно було зрозуміло, що без нормального конфігуратора керувати нормальним шейпером «важкувато», але… все ускладнювала одна … Continue readingFinally: my django-based configurator for HTB shaper works
Regarding the problem with shaping vlan-tagged traffic on linux bridge — it was my fault :-) I asked community@lists.altlinux.org, and Sergey Vlasov answered me with some info and hint — thanks a lot!-) As Sergey told, «a packet is being passed to bridge module before 8021q can … Continue readingHTB/8021q: That was my fault
Update: there are no any problem with vlans in classifiers, that was my fault. Have been playing with shapers and run into such a problem: u32 classifier does not work (?) for tagged traffic on «non-tagged» linux bridge. In more details: Test bed: Let’s take … Continue readingProblem with shaping vlan-tagged traffic on linux bridge
A history. Some time ago i was looking for a generator of OSPF Hello packets for bombing «test bed». After twidding with packEth (i was catching/forming/checking packets, it was lazy and sleepy, hung occasionally) i left this idea — took two cisco routers and set a … Continue readingUsing Scapy for… fun :-)