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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. 


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.


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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