netmod

[Christos Ricudis]

Hello Papadogiannakis!

  On 19 Feb 02, Papadogiannakis Vagelis wrote to All with subject "Re: netmod":

 >> 
 >> Sto /etc/ppp/options.
 >> 
 >> <<V13>>

 PV> An kano la8os (pi8ano) dior8oste me, alla bsdcomp kai deflate
 PV> den paizoun se netmod giati den ipostirizei software simpiesi.

Ki edw brisketai kai h psilofundamental malakia toy netmod (kai oxi mono, twn
perissoterwn serial TA's). Sto gegonos oti kanei PPP protocol spoofing. 

Ayto ginetai gia 2 logous : 

1) Async-to-sync PPP
2) PPP-to-MLPPP

To spoofing toys den einai kai toso kalo. Exei problhma me asyncmaps
diaforetika toy 0 (sto opoio ofeiletai kai h pleionothta twn
linuxonetmodproblhmatwn), kai den yposthrizei compression/CCP. Epishs, kapou
prepei na synebhke mia malakia, giati to netmod den einai ENTELWS transparent
panw apo to PPP, opws 8a eprepe na einai. Yparxoun sequences poy predictably
'kollane' to netmod. 

Ola ayta ta lew meta apo aplh symperiforikh parathrhsh, den exw gnwsh twn
internals toy netmod. Ean kapoios emmis8os praktoras toy kokk.... e, sygnwmmh,
ergazomenos sthn Intracom, 8elei na me dior8wsei, ton prokalw na dokimasei.
Fysika, epifylassomai na ana8ewrhsw tis apopseis moy se periptwsh proslhpshs
mou se ypshlomis8h 8esh sto R&D ths Intracom :> 

Deytereyon, alla eksisou shmantiko zhthma : Oi perissoteroi ISP's xrhsimopoioyn
sta dialup toys CISCO AS5300s kai 36xx. Den eimai sigouros an o 5300
yposthrizei PPP Compression over ISDN - sto default configuration sigoura den
yposthrizei, yparxoyn compression modules gia alla montela (36xx, 2600, 7200)
alla sto reference toy 5300 den eida kammia sxetikh anafora. BTW, o 5300 einai
pleon End of Life product, oper shmainei oti sthn Ellada 8a apantatai akoma
mono gia ta epomena 15 me 20 xronia. 

Triton. To PPP compression mporei na ayksanei to thgoughput, alla anebazei to
latency. It has been reported that merika milliseconds perissotero latency
einai ikana na ephreasoyn shmantika critical diktyakes efarmoges, opws logou
xarh thn ekbash enos Quake Deathmatch. 

--
Christos Ricudis

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