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CITRIX (ADC) NETSCALER RATE LIMIT KULLANIMI

Bilgi:

Netscaler üzerinden Rate Limiting özelliğini kullanarak, herhangi bir ip’den ve herhangi bir url’e yapılan istek sayısı, kullanıcıların connection sayısı, bantwidth sınırlama gibi birçok veriye göre limitleme yapılabilmektedir. 

Talimatlar:

1) Rate Limit Selector Oluşturma

Limit selector ile hangi verilere göre limitleme yapacağımızı seçiyoruz.

Limit Selectorümüzü tanımlayalım:

AppExpert à Rate Limiting à Limit Selectors ->Add       

Herhangi bir IP’den Herhangi bir URL’e = CLIENT.IP.SRC –  HTTP.REQ.URL

2) Rate Limit Identifiers Oluşturma

Limit Selector oluşturduktan sonra, policy  yani limit identifiers oluşturmamız gerekiyor.

AppExpert à Rate Limiting à Limit Identifiers -> Add

Name: Policye bir isim veriyoruz.

Selector: Az önce oluşturduğumuz Limit Selectorü seçiyoruz.

Threshold: Limit değerini belirliyoruz. Limitimiz 5’di.

Time Slice: Ne kadarlık zaman içinde limitleyeceğimizi belirliyoruz. Örneğimizdeki zamanımız 100 saniye olduğu için 100000 yazdık.

Rate Limit policyleri Advanced policyler altından ile aşağıdaki expression ile çağrılmaktadır.

SYS.CHECK_LIMIT(“ratelimit_identifier”)

Advanced policy tanımlayağınız modüller:

Responder: Limitlediğiniz istekleri bu modül ile DROP, RESET, RESPOND WITH, REDIRECT aksiyonlarını oluşturabilirsiniz.

Rewrite: Limitlediğiniz istekleri bu modül ile DROP, RESET, İstekteki bir bilgiyi silme/ekleme/değiştirme aksiyonları oluşturabilirisiniz.

NOT: Yukarıdaki policy ile “Herhangi bir IP’den Herhangi bir URL’e 100 saniye içinde 5 istekten fazla olan istekler limitlenecek, ve sizin belirlediğiniz aksiyon alınacak, AYRICA SONRAKİ 100 SANİYE BOYUNCA O CLİENT KARANTİNA ALINACAK VE AYNI AKSİYON 100 SANİYE BOYUNCA DEVREDE OLACAKTIR. KARANTİNAYA ALINAN CLIENTLARI

Rate Limiting > Limit Identifiers > Show Sessions ile görebilirsiniz.

3) Responder Action Oluşturma:

İlk önce aksiyonumuzu belirliyoruz. Bunun için;

AppExpert > Responder > Action > Add

4) Responder Policy Oluşturma:

Responder policy tanımını oluşturuyoruz. Bunun için;

AppExpert > Reponder > Policies > Add

Bu işlemden sonra oluşturmuş olduğumuz Responder policy’ i ilgili Load Balance tanımımıza bind edebiliriz.

Tarih:Citrix (ADC) Netscaler

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