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.
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